/*
 * EAP peer method: EAP-PEAP (draft-josefsson-pppext-eap-tls-eap-10.txt)
 * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
 *
 * This software may be distributed under the terms of the BSD license.
 * See README for more details.
 */
#ifdef EAP_PEAP

#include "wpa/includes.h"

#include "wpa/common.h"
#include "crypto/sha1.h"
#include "wpa2/tls/tls.h"
#include "wpa2/eap_peer/eap_tlv_common.h"
#include "wpa2/eap_peer/eap_peap_common.h"
#include "wpa2/eap_peer/eap_i.h"
#include "wpa2/eap_peer/eap_tls_common.h"
#include "wpa2/eap_peer/eap_config.h"
#include "wpa2/eap_peer/eap_methods.h"
//#include "tncc.h"

#ifdef MEMLEAK_DEBUG
static const char mem_debug_file[] ICACHE_RODATA_ATTR = __FILE__;
#endif

/* 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_deinit(struct eap_sm* sm, void* priv);


struct eap_peap_data {
    struct eap_ssl_data ssl;

    int peap_version, force_peap_version, force_new_label;

    const struct eap_method* phase2_method;
    void* phase2_priv;
    int phase2_success;
    int phase2_eap_success;
    int phase2_eap_started;

    struct eap_method_type phase2_type;
    struct eap_method_type* phase2_types;
    size_t num_phase2_types;

    int peap_outer_success; /* 0 = PEAP terminated on Phase 2 inner
				 * EAP-Success
				 * 1 = reply with tunneled EAP-Success to inner
				 * EAP-Success and expect AS to send outer
				 * (unencrypted) EAP-Success after this
				 * 2 = reply with PEAP/TLS ACK to inner
				 * EAP-Success and expect AS to send outer
				 * (unencrypted) EAP-Success after this */
    int resuming; /* starting a resumed session */
    int reauth; /* reauthentication */
    u8* key_data;
    u8* session_id;
    size_t id_len;

    struct wpabuf* pending_phase2_req;
    enum { NO_BINDING, OPTIONAL_BINDING, REQUIRE_BINDING } crypto_binding;
    int crypto_binding_used;
    u8 binding_nonce[32];
    u8 ipmk[40];
    u8 cmk[20];
    int soh; /* Whether IF-TNCCS-SOH (Statement of Health; Microsoft NAP)
		  * is enabled. */
};


static int
eap_peap_parse_phase1(struct eap_peap_data* data,
                      const char* phase1)
{
    const char* pos;

    pos = os_strstr(phase1, "peapver=");

    if (pos) {
        data->force_peap_version = atoi(pos + 8);
        data->peap_version = data->force_peap_version;
        wpa_printf(MSG_DEBUG, "EAP-PEAP: Forced PEAP version %d",
                   data->force_peap_version);
    }

    if (os_strstr(phase1, "peaplabel=1")) {
        data->force_new_label = 1;
        wpa_printf(MSG_DEBUG, "EAP-PEAP: Force new label for key "
                   "derivation");
    }

    if (os_strstr(phase1, "peap_outer_success=0")) {
        data->peap_outer_success = 0;
        wpa_printf(MSG_DEBUG, "EAP-PEAP: terminate authentication on "
                   "tunneled EAP-Success");
    } else if (os_strstr(phase1, "peap_outer_success=1")) {
        data->peap_outer_success = 1;
        wpa_printf(MSG_DEBUG, "EAP-PEAP: send tunneled EAP-Success "
                   "after receiving tunneled EAP-Success");
    } else if (os_strstr(phase1, "peap_outer_success=2")) {
        data->peap_outer_success = 2;
        wpa_printf(MSG_DEBUG, "EAP-PEAP: send PEAP/TLS ACK after "
                   "receiving tunneled EAP-Success");
    }

    if (os_strstr(phase1, "crypto_binding=0")) {
        data->crypto_binding = NO_BINDING;
        wpa_printf(MSG_DEBUG, "EAP-PEAP: Do not use cryptobinding");
    } else if (os_strstr(phase1, "crypto_binding=1")) {
        data->crypto_binding = OPTIONAL_BINDING;
        wpa_printf(MSG_DEBUG, "EAP-PEAP: Optional cryptobinding");
    } else if (os_strstr(phase1, "crypto_binding=2")) {
        data->crypto_binding = REQUIRE_BINDING;
        wpa_printf(MSG_DEBUG, "EAP-PEAP: Require cryptobinding");
    }

#ifdef EAP_TNC

    if (os_strstr(phase1, "tnc=soh2")) {
        data->soh = 2;
        wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 2 enabled");
    } else if (os_strstr(phase1, "tnc=soh1")) {
        data->soh = 1;
        wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 1 enabled");
    } else if (os_strstr(phase1, "tnc=soh")) {
        data->soh = 2;
        wpa_printf(MSG_DEBUG, "EAP-PEAP: SoH version 2 enabled");
    }

#endif /* EAP_TNC */

    return 0;
}


static void*
eap_peap_init(struct eap_sm* sm)
{
    struct eap_peap_data* data;
    struct eap_peer_config* config = eap_get_config(sm);

    data = (struct eap_peap_data*)os_zalloc(sizeof(*data));

    if (data == NULL) {
        return NULL;
    }

    sm->peap_done = FALSE;
    data->peap_version = EAP_PEAP_VERSION;
    data->force_peap_version = -1;
    data->peap_outer_success = 2;
    data->crypto_binding = OPTIONAL_BINDING;

    if (config && config->phase1 &&
            eap_peap_parse_phase1(data, config->phase1) < 0) {
        eap_peap_deinit(sm, data);
        return NULL;
    }

    if (eap_peer_select_phase2_methods(config, "auth=",
                                       &data->phase2_types,
                                       &data->num_phase2_types) < 0) {
        eap_peap_deinit(sm, data);
        return NULL;
    }

    data->phase2_type.vendor = EAP_VENDOR_IETF;
    data->phase2_type.method = EAP_TYPE_NONE;

    if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_PEAP)) {
        wpa_printf(MSG_INFO, "EAP-PEAP: Failed to initialize SSL.");
        eap_peap_deinit(sm, data);
        return NULL;
    }

    return data;
}


static void
eap_peap_deinit(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->deinit(sm, data->phase2_priv);
    }

    os_free(data->phase2_types);
    eap_peer_tls_ssl_deinit(sm, &data->ssl);
    os_free(data->key_data);
    os_free(data->session_id);
    wpabuf_free(data->pending_phase2_req);
    os_free(data);
}


/**
 * eap_tlv_build_nak - Build EAP-TLV NAK message
 * @id: EAP identifier for the header
 * @nak_type: TLV type (EAP_TLV_*)
 * Returns: Buffer to the allocated EAP-TLV NAK message or %NULL on failure
 *
 * This function builds an EAP-TLV NAK message. The caller is responsible for
 * freeing the returned buffer.
 */
static struct wpabuf*
eap_tlv_build_nak(int id, u16 nak_type)
{
    struct wpabuf* msg;

    msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, 10,
                        EAP_CODE_RESPONSE, id);

    if (msg == NULL) {
        return NULL;
    }

    wpabuf_put_u8(msg, 0x80); /* Mandatory */
    wpabuf_put_u8(msg, EAP_TLV_NAK_TLV);
    wpabuf_put_be16(msg, 6); /* Length */
    wpabuf_put_be32(msg, 0); /* Vendor-Id */
    wpabuf_put_be16(msg, nak_type); /* NAK-Type */

    return msg;
}


static int
eap_peap_get_isk(struct eap_sm* sm, struct eap_peap_data* data,
                 u8* isk, size_t isk_len)
{
    u8* key;
    size_t key_len;

    os_memset(isk, 0, isk_len);

    if (data->phase2_method == NULL || data->phase2_priv == NULL ||
            data->phase2_method->isKeyAvailable == NULL ||
            data->phase2_method->getKey == NULL) {
        return 0;
    }

    if (!data->phase2_method->isKeyAvailable(sm, data->phase2_priv) ||
            (key = data->phase2_method->getKey(sm, data->phase2_priv,
                    &key_len)) == NULL) {
        wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not get key material "
                   "from Phase 2");
        return -1;
    }

    if (key_len > isk_len) {
        key_len = isk_len;
    }

    os_memcpy(isk, key, key_len);
    os_free(key);

    return 0;
}


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 = data->key_data;

    if (tk == NULL) {
        return -1;
    }

    wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: TK", tk, 60);

    if (data->reauth &&
            tls_connection_resumed(sm->ssl_ctx, data->ssl.conn)) {
        /* Fast-connect: IPMK|CMK = TK */
        os_memcpy(data->ipmk, tk, 40);
        wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IPMK from TK",
                        data->ipmk, 40);
        os_memcpy(data->cmk, tk + 40, 20);
        wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CMK from TK",
                        data->cmk, 20);
        return 0;
    }

    if (eap_peap_get_isk(sm, data, isk, sizeof(isk)) < 0) {
        return -1;
    }

    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);

    if (peap_prfplus(data->peap_version, tk, 40,
                     "Inner Methods Compound Keys",
                     isk, sizeof(isk), imck, sizeof(imck)) < 0) {
        return -1;
    }

    wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: IMCK (IPMKj)",
                    imck, sizeof(imck));

    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 int
eap_tlv_add_cryptobinding(struct eap_sm* sm,
                          struct eap_peap_data* data,
                          struct wpabuf* buf)
{
    u8* mac;
    u8 eap_type = EAP_TYPE_PEAP;
    const u8* addr[2];
    size_t len[2];
    u16 tlv_type;

    /* 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->peap_version); /* RecvVersion */
    wpabuf_put_u8(buf, 1); /* 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_used = 1;

    return 0;
}


/**
 * eap_tlv_build_result - Build EAP-TLV Result message
 * @id: EAP identifier for the header
 * @status: Status (EAP_TLV_RESULT_SUCCESS or EAP_TLV_RESULT_FAILURE)
 * Returns: Buffer to the allocated EAP-TLV Result message or %NULL on failure
 *
 * This function builds an EAP-TLV Result message. The caller is responsible
 * for freeing the returned buffer.
 */
static struct wpabuf*
eap_tlv_build_result(struct eap_sm* sm,
                     struct eap_peap_data* data,
                     int crypto_tlv_used,
                     int id, u16 status)
{
    struct wpabuf* msg;
    size_t len;

    if (data->crypto_binding == NO_BINDING) {
        crypto_tlv_used = 0;
    }

    len = 6;

    if (crypto_tlv_used) {
        len += 60;    /* Cryptobinding TLV */
    }

    msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_TLV, len,
                        EAP_CODE_RESPONSE, id);

    if (msg == NULL) {
        return NULL;
    }

    wpabuf_put_u8(msg, 0x80); /* Mandatory */
    wpabuf_put_u8(msg, EAP_TLV_RESULT_TLV);
    wpabuf_put_be16(msg, 2); /* Length */
    wpabuf_put_be16(msg, status); /* Status */

    if (crypto_tlv_used && eap_tlv_add_cryptobinding(sm, data, msg)) {
        wpabuf_free(msg);
        return NULL;
    }

    return msg;
}


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 (eap_peap_derive_cmk(sm, data) < 0) {
        wpa_printf(MSG_DEBUG, "EAP-PEAP: Could not derive CMK");
        return -1;
    }

    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] != 0) {
        wpa_printf(MSG_DEBUG, "EAP-PEAP: Unexpected Cryptobinding TLV "
                   "SubType %d", pos[3]);
        return -1;
    }

    pos += 4;
    os_memcpy(data->binding_nonce, pos, 32);
    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;
    wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Compound_MAC data",
                buf, sizeof(buf));
    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(MSG_DEBUG, "EAP-PEAP: Received MAC",
                    pos, SHA1_MAC_LEN);
        wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Expected MAC",
                    mac, SHA1_MAC_LEN);
        return -1;
    }

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

    return 0;
}


/**
 * eap_tlv_process - Process a received EAP-TLV message and generate a response
 * @sm: Pointer to EAP state machine allocated with eap_peer_sm_init()
 * @ret: Return values from EAP request validation and processing
 * @req: EAP-TLV request to be processed. The caller must have validated that
 * the buffer is large enough to contain full request (hdr->length bytes) and
 * that the EAP type is EAP_TYPE_TLV.
 * @resp: Buffer to return a pointer to the allocated response message. This
 * field should be initialized to %NULL before the call. The value will be
 * updated if a response message is generated. The caller is responsible for
 * freeing the allocated message.
 * @force_failure: Force negotiation to fail
 * Returns: 0 on success, -1 on failure
 */
static int
eap_tlv_process(struct eap_sm* sm, struct eap_peap_data* data,
                struct eap_method_ret* ret,
                const struct wpabuf* req, struct wpabuf** resp,
                int force_failure)
{
    size_t left, tlv_len;
    const u8* pos;
    const u8* result_tlv = NULL, *crypto_tlv = NULL;
    size_t result_tlv_len = 0, crypto_tlv_len = 0;
    int tlv_type, mandatory;

    /* Parse TLVs */
    pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_TLV, req, &left);

    if (pos == NULL) {
        return -1;
    }

    wpa_hexdump(MSG_DEBUG, "EAP-TLV: Received TLVs", pos, left);

    while (left >= 4) {
        mandatory = !!(pos[0] & 0x80);
        tlv_type = WPA_GET_BE16(pos) & 0x3fff;
        pos += 2;
        tlv_len = WPA_GET_BE16(pos);
        pos += 2;
        left -= 4;

        if (tlv_len > left) {
            wpa_printf(MSG_DEBUG, "EAP-TLV: TLV underrun "
                       "(tlv_len=%lu left=%lu)",
                       (unsigned long) tlv_len,
                       (unsigned long) left);
            return -1;
        }

        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-TLV: Unsupported TLV Type "
                           "%d%s", tlv_type,
                           mandatory ? " (mandatory)" : "");

                if (mandatory) {
                    /* NAK TLV and ignore all TLVs in this packet.
                     */
                    *resp = eap_tlv_build_nak(eap_get_id(req),
                                              tlv_type);
                    return *resp == NULL ? -1 : 0;
                }

                /* Ignore this TLV, but process other TLVs */
                break;
        }

        pos += tlv_len;
        left -= tlv_len;
    }

    if (left) {
        wpa_printf(MSG_DEBUG, "EAP-TLV: Last TLV too short in "
                   "Request (left=%lu)", (unsigned long) left);
        return -1;
    }

    /* Process supported TLVs */
    if (crypto_tlv && data->crypto_binding != NO_BINDING) {
        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) {
            if (result_tlv == NULL) {
                return -1;
            }

            force_failure = 1;
            crypto_tlv = NULL; /* do not include Cryptobinding TLV
					    * in response, if the received
					    * cryptobinding was invalid. */
        }
    } else if (!crypto_tlv && data->crypto_binding == REQUIRE_BINDING) {
        wpa_printf(MSG_DEBUG, "EAP-PEAP: No cryptobinding TLV");
        return -1;
    }

    if (result_tlv) {
        int status, resp_status;
        wpa_hexdump(MSG_DEBUG, "EAP-TLV: Result TLV",
                    result_tlv, result_tlv_len);

        if (result_tlv_len < 2) {
            wpa_printf(MSG_INFO, "EAP-TLV: Too short Result TLV "
                       "(len=%lu)",
                       (unsigned long) result_tlv_len);
            return -1;
        }

        status = WPA_GET_BE16(result_tlv);

        if (status == EAP_TLV_RESULT_SUCCESS) {
            wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Success "
                       "- EAP-TLV/Phase2 Completed");

            if (force_failure) {
                wpa_printf(MSG_INFO, "EAP-TLV: Earlier failure"
                           " - force failed Phase 2");
                resp_status = EAP_TLV_RESULT_FAILURE;
                ret->decision = DECISION_FAIL;
            } else {
                resp_status = EAP_TLV_RESULT_SUCCESS;
                ret->decision = DECISION_UNCOND_SUCC;
            }
        } else if (status == EAP_TLV_RESULT_FAILURE) {
            wpa_printf(MSG_INFO, "EAP-TLV: TLV Result - Failure");
            resp_status = EAP_TLV_RESULT_FAILURE;
            ret->decision = DECISION_FAIL;
        } else {
            wpa_printf(MSG_INFO, "EAP-TLV: Unknown TLV Result "
                       "Status %d", status);
            resp_status = EAP_TLV_RESULT_FAILURE;
            ret->decision = DECISION_FAIL;
        }

        ret->methodState = METHOD_DONE;

        *resp = eap_tlv_build_result(sm, data, crypto_tlv != NULL,
                                     eap_get_id(req), resp_status);
    }

    return 0;
}


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 int
eap_peap_phase2_request(struct eap_sm* sm,
                        struct eap_peap_data* data,
                        struct eap_method_ret* ret,
                        struct wpabuf* req,
                        struct wpabuf** resp)
{
    struct eap_hdr* hdr = wpabuf_mhead(req);
    size_t len = be_to_host16(hdr->length);
    u8* pos;
    struct eap_method_ret iret;
    //struct eap_peer_config *config = eap_get_config(sm);

    if (len <= sizeof(struct eap_hdr)) {
        wpa_printf(MSG_INFO, "EAP-PEAP: too short "
                   "Phase 2 request (len=%lu)", (unsigned long) len);
        return -1;
    }

    pos = (u8*)(hdr + 1);
    wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Request: type=%d\n", *pos);

    switch (*pos) {
        case EAP_TYPE_IDENTITY:
            *resp = eap_sm_build_identity_resp(sm, hdr->identifier, 1);
            break;

        case EAP_TYPE_TLV:
            os_memset(&iret, 0, sizeof(iret));

            if (eap_tlv_process(sm, data, &iret, req, resp,
                                data->phase2_eap_started &&
                                !data->phase2_eap_success)) {
                ret->methodState = METHOD_DONE;
                ret->decision = DECISION_FAIL;
                return -1;
            }

            if (iret.methodState == METHOD_DONE ||
                    iret.methodState == METHOD_MAY_CONT) {
                ret->methodState = iret.methodState;
                ret->decision = iret.decision;
                data->phase2_success = 1;
            }

            break;

        case EAP_TYPE_EXPANDED:
#ifdef EAP_TNC
            if (data->soh) {
                const u8* epos;
                size_t eleft;

                epos = eap_hdr_validate(EAP_VENDOR_MICROSOFT, 0x21,
                                        req, &eleft);

                if (epos) {
                    struct wpabuf* buf;
                    wpa_printf(MSG_DEBUG,
                               "EAP-PEAP: SoH EAP Extensions");
                    buf = tncc_process_soh_request(data->soh,
                                                   epos, eleft);

                    if (buf) {
                        *resp = eap_msg_alloc(
                                    EAP_VENDOR_MICROSOFT, 0x21,
                                    wpabuf_len(buf),
                                    EAP_CODE_RESPONSE,
                                    hdr->identifier);

                        if (*resp == NULL) {
                            ret->methodState = METHOD_DONE;
                            ret->decision = DECISION_FAIL;
                            return -1;
                        }

                        wpabuf_put_buf(*resp, buf);
                        wpabuf_free(buf);
                        break;
                    }
                }
            }

#endif /* EAP_TNC */

        /* fall through */
        default:
            if (data->phase2_type.vendor == EAP_VENDOR_IETF &&
                    data->phase2_type.method == EAP_TYPE_NONE) {
                size_t i;

                for (i = 0; i < data->num_phase2_types; i++) {
                    if (data->phase2_types[i].vendor !=
                            EAP_VENDOR_IETF ||
                            data->phase2_types[i].method != *pos) {
                        continue;
                    }

                    data->phase2_type.vendor =
                        data->phase2_types[i].vendor;
                    data->phase2_type.method =
                        data->phase2_types[i].method;
                    wpa_printf(MSG_DEBUG, "EAP-PEAP: Selected "
                               "Phase 2 EAP vendor %d method %d\n",
                               data->phase2_type.vendor,
                               data->phase2_type.method);
                    break;
                }
            }

            if (*pos != data->phase2_type.method ||
                    *pos == EAP_TYPE_NONE) {
                if (eap_peer_tls_phase2_nak(data->phase2_types,
                                            data->num_phase2_types,
                                            hdr, resp)) {
                    return -1;
                }

                return 0;
            }

            if (data->phase2_priv == NULL) {
                data->phase2_method = eap_peer_get_eap_method(
                                          data->phase2_type.vendor,
                                          data->phase2_type.method);

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

            if (data->phase2_priv == NULL || data->phase2_method == NULL) {
                wpa_printf(MSG_ERROR, "EAP-PEAP: failed to initialize "
                           "Phase 2 EAP method %d\n", *pos);
                ret->methodState = METHOD_DONE;
                ret->decision = DECISION_FAIL;
                return -1;
            }

            data->phase2_eap_started = 1;
            os_memset(&iret, 0, sizeof(iret));
            *resp = data->phase2_method->process(sm, data->phase2_priv,
                                                 &iret, req);

            if ((iret.methodState == METHOD_DONE ||
                    iret.methodState == METHOD_MAY_CONT) &&
                    (iret.decision == DECISION_UNCOND_SUCC ||
                     iret.decision == DECISION_COND_SUCC)) {
                data->phase2_eap_success = 1;
                data->phase2_success = 1;
            }

            break;
    }

    if (*resp == NULL) {
        wpa_printf(MSG_ERROR, "phase 2 response failure\n");
        wpabuf_free(data->pending_phase2_req);
        data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
    }

    /*	if (*resp == NULL &&
    	    (config->pending_req_identity || config->pending_req_password ||
    	     config->pending_req_otp || config->pending_req_new_password)) {
    		wpabuf_free(data->pending_phase2_req);
    		data->pending_phase2_req = wpabuf_alloc_copy(hdr, len);
    	}*/

    return 0;
}


static int
eap_peap_decrypt(struct eap_sm* sm, struct eap_peap_data* data,
                 struct eap_method_ret* ret,
                 const struct eap_hdr* req,
                 const struct wpabuf* in_data,
                 struct wpabuf** out_data)
{
    struct wpabuf* in_decrypted = NULL;
    int res, skip_change = 0;
    struct eap_hdr* hdr, *rhdr;
    struct wpabuf* resp = NULL;
    size_t len;

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

    if (data->pending_phase2_req) {
        wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 request - "
                   "skip decryption and use old data");
        /* Clear TLS reassembly state. */
        eap_peer_tls_reset_input(&data->ssl);
        in_decrypted = data->pending_phase2_req;
        data->pending_phase2_req = NULL;
        skip_change = 1;
        goto continue_req;
    }

    if (wpabuf_len(in_data) == 0 && sm->workaround &&
            data->phase2_success) {
        /*
         * Cisco ACS seems to be using TLS ACK to terminate
         * EAP-PEAPv0/GTC. Try to reply with TLS ACK.
         */
        wpa_printf(MSG_DEBUG, "EAP-PEAP: Received TLS ACK, but "
                   "expected data - acknowledge with TLS ACK since "
                   "Phase 2 has been completed");
        ret->decision = DECISION_COND_SUCC;
        ret->methodState = METHOD_DONE;
        return 1;
    } else if (wpabuf_len(in_data) == 0) {
        /* Received TLS ACK - requesting more fragments */
        return eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
                                    data->peap_version,
                                    req->identifier, NULL, out_data);
    }

    res = eap_peer_tls_decrypt(sm, &data->ssl, in_data, &in_decrypted);

    if (res) {
        return res;
    }

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

    hdr = wpabuf_mhead(in_decrypted);

    if (wpabuf_len(in_decrypted) == 5 && hdr->code == EAP_CODE_REQUEST &&
            be_to_host16(hdr->length) == 5 &&
            eap_get_type(in_decrypted) == EAP_TYPE_IDENTITY) {
        /* At least FreeRADIUS seems to send full EAP header with
         * EAP Request Identity */
        skip_change = 1;
    }

    if (wpabuf_len(in_decrypted) >= 5 && hdr->code == EAP_CODE_REQUEST &&
            eap_get_type(in_decrypted) == EAP_TYPE_TLV) {
        skip_change = 1;
    }

    if (data->peap_version == 0 && !skip_change) {
        struct eap_hdr* nhdr;
        struct wpabuf* nmsg = wpabuf_alloc(sizeof(struct eap_hdr) +
                                           wpabuf_len(in_decrypted));

        if (nmsg == NULL) {
            wpabuf_free(in_decrypted);
            return 0;
        }

        nhdr = wpabuf_put(nmsg, sizeof(*nhdr));
        wpabuf_put_buf(nmsg, in_decrypted);
        nhdr->code = req->code;
        nhdr->identifier = req->identifier;
        nhdr->length = host_to_be16(sizeof(struct eap_hdr) +
                                    wpabuf_len(in_decrypted));

        wpabuf_free(in_decrypted);
        in_decrypted = nmsg;
    }

    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 0;
        }

        tlv = wpabuf_mhead(in_decrypted);

        if ((be_to_host16(tlv->tlv_type) & 0x3fff) !=
                EAP_TLV_EAP_PAYLOAD_TLV) {
            wpa_printf(MSG_INFO, "EAP-PEAPv2: Not an EAP TLV");
            wpabuf_free(in_decrypted);
            return 0;
        }

        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 0;
        }

        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 0;
        }

        nmsg = wpabuf_alloc(be_to_host16(hdr->length));

        if (nmsg == NULL) {
            wpabuf_free(in_decrypted);
            return 0;
        }

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

    hdr = wpabuf_mhead(in_decrypted);

    if (wpabuf_len(in_decrypted) < 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);
        return 0;
    }

    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);
        return 0;
    }

    if (len < wpabuf_len(in_decrypted)) {
        wpa_printf(MSG_INFO, "EAP-PEAP: Odd.. Phase 2 EAP header has "
                   "shorter length than full decrypted data "
                   "(%lu < %lu)",
                   (unsigned long) len,
                   (unsigned long) wpabuf_len(in_decrypted));
    }

    wpa_printf(MSG_DEBUG, "EAP-PEAP: received Phase 2: code=%d "
               "identifier=%d length=%lu\n", hdr->code, hdr->identifier,
               (unsigned long) len);

    switch (hdr->code) {
        case EAP_CODE_REQUEST:
            if (eap_peap_phase2_request(sm, data, ret, in_decrypted,
                                        &resp)) {
                wpabuf_free(in_decrypted);
                wpa_printf(MSG_ERROR, "EAP-PEAP: Phase2 Request "
                           "processing failed\n");
                return 0;
            }

            break;

        case EAP_CODE_SUCCESS:
            wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Success\n");

            if (data->peap_version == 1) {
                /* EAP-Success within TLS tunnel is used to indicate
                 * shutdown of the TLS channel. The authentication has
                 * been completed. */
                if (data->phase2_eap_started &&
                        !data->phase2_eap_success) {
                    wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 "
                               "Success used to indicate success, "
                               "but Phase 2 EAP was not yet "
                               "completed successfully");
                    ret->methodState = METHOD_DONE;
                    ret->decision = DECISION_FAIL;
                    wpabuf_free(in_decrypted);
                    return 0;
                }

                wpa_printf(MSG_DEBUG, "EAP-PEAP: Version 1 - "
                           "EAP-Success within TLS tunnel - "
                           "authentication completed");
                ret->decision = DECISION_UNCOND_SUCC;
                ret->methodState = METHOD_DONE;
                data->phase2_success = 1;

                if (data->peap_outer_success == 2) {
                    wpabuf_free(in_decrypted);
                    wpa_printf(MSG_DEBUG, "EAP-PEAP: Use TLS ACK "
                               "to finish authentication");
                    return 1;
                } else if (data->peap_outer_success == 1) {
                    /* Reply with EAP-Success within the TLS
                     * channel to complete the authentication. */
                    resp = wpabuf_alloc(sizeof(struct eap_hdr));

                    if (resp) {
                        rhdr = wpabuf_put(resp, sizeof(*rhdr));
                        rhdr->code = EAP_CODE_SUCCESS;
                        rhdr->identifier = hdr->identifier;
                        rhdr->length =
                            host_to_be16(sizeof(*rhdr));
                    }
                } else {
                    /* No EAP-Success expected for Phase 1 (outer,
                     * unencrypted auth), so force EAP state
                     * machine to SUCCESS state. */
                    sm->peap_done = TRUE;
                }
            } else {
                /* FIX: ? */
            }

            break;

        case EAP_CODE_FAILURE:
            wpa_printf(MSG_DEBUG, "EAP-PEAP: Phase 2 Failure\n");
            ret->decision = DECISION_FAIL;
            ret->methodState = METHOD_MAY_CONT;
            ret->allowNotifications = FALSE;
            /* Reply with EAP-Failure within the TLS channel to complete
             * failure reporting. */
            resp = wpabuf_alloc(sizeof(struct eap_hdr));

            if (resp) {
                rhdr = wpabuf_put(resp, sizeof(*rhdr));
                rhdr->code = EAP_CODE_FAILURE;
                rhdr->identifier = hdr->identifier;
                rhdr->length = host_to_be16(sizeof(*rhdr));
            }

            break;

        default:
            wpa_printf(MSG_INFO, "EAP-PEAP: Unexpected code=%d in "
                       "Phase 2 EAP header", hdr->code);
            break;
    }

    wpabuf_free(in_decrypted);

    if (resp) {
        int skip_change2 = 0;
        struct wpabuf* rmsg, buf;

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

        /* PEAP version changes */
        if (data->peap_version >= 2) {
            resp = eap_peapv2_tlv_eap_payload(resp);

            if (resp == NULL) {
                return -1;
            }
        }

        if (wpabuf_len(resp) >= 5 &&
                wpabuf_head_u8(resp)[0] == EAP_CODE_RESPONSE &&
                eap_get_type(resp) == EAP_TYPE_TLV) {
            skip_change2 = 1;
        }

        rmsg = resp;

        if (data->peap_version == 0 && !skip_change2) {
            wpabuf_set(&buf, wpabuf_head_u8(resp) +
                       sizeof(struct eap_hdr),
                       wpabuf_len(resp) - sizeof(struct eap_hdr));
            rmsg = &buf;
        }

        if (eap_peer_tls_encrypt(sm, &data->ssl, EAP_TYPE_PEAP,
                                 data->peap_version, req->identifier,
                                 rmsg, out_data)) {
            wpa_printf(MSG_INFO, "EAP-PEAP: Failed to encrypt "
                       "a Phase 2 frame");
        }

        wpabuf_free(resp);
    }

    return 0;
}


static struct wpabuf*
eap_peap_process(struct eap_sm* sm, void* priv,
                 struct eap_method_ret* ret,
                 const struct wpabuf* reqData)
{
    const struct eap_hdr* req;
    size_t left;
    int res;
    u8 flags, id;
    struct wpabuf* resp;
    const u8* pos;
    struct eap_peap_data* data = priv;

    pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_PEAP, ret,
                                    reqData, &left, &flags);

    if (pos == NULL) {
        return NULL;
    }

    req = wpabuf_head(reqData);
    id = req->identifier;

    if (flags & EAP_TLS_FLAGS_START) {
        wpa_printf(MSG_DEBUG, "EAP-PEAP: Start (server ver=%d, own "
                   "ver=%d)", flags & EAP_TLS_VERSION_MASK,
                   data->peap_version);

        if ((flags & EAP_TLS_VERSION_MASK) < data->peap_version) {
            data->peap_version = flags & EAP_TLS_VERSION_MASK;
        }

        if (data->force_peap_version >= 0 &&
                data->force_peap_version != data->peap_version) {
            wpa_printf(MSG_WARNING, "EAP-PEAP: Failed to select "
                       "forced PEAP version %d",
                       data->force_peap_version);
            ret->methodState = METHOD_DONE;
            ret->decision = DECISION_FAIL;
            ret->allowNotifications = FALSE;
            return NULL;
        }

        wpa_printf(MSG_DEBUG, "EAP-PEAP: Using PEAP version %d",
                   data->peap_version);
        left = 0; /* make sure that this frame is empty, even though it
			   * should always be, anyway */
    }

    resp = NULL;

    if (tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
            !data->resuming) {
        struct wpabuf msg;
        wpabuf_set(&msg, pos, left);
        res = eap_peap_decrypt(sm, data, ret, req, &msg, &resp);
    } else {
        res = eap_peer_tls_process_helper(sm, &data->ssl,
                                          EAP_TYPE_PEAP,
                                          data->peap_version, id, pos,
                                          left, &resp);

        if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
            char* label;
            wpa_printf(MSG_DEBUG,
                       "EAP-PEAP: TLS done, proceed to Phase 2");
            os_free(data->key_data);

            /* draft-josefsson-ppext-eap-tls-eap-05.txt
             * specifies that PEAPv1 would use "client PEAP
             * encryption" as the label. However, most existing
             * PEAPv1 implementations seem to be using the old
             * label, "client EAP encryption", instead. Use the old
             * label by default, but allow it to be configured with
             * phase1 parameter peaplabel=1. */
            if (data->peap_version > 1 || data->force_new_label) {
                label = "client PEAP encryption";
            } else {
                label = "client EAP encryption";
            }

            wpa_printf(MSG_DEBUG, "EAP-PEAP: using label '%s' in "
                       "key derivation", label);
            data->key_data =
                eap_peer_tls_derive_key(sm, &data->ssl, label,
                                        EAP_TLS_KEY_LEN);

            if (data->key_data) {
                wpa_hexdump_key(MSG_DEBUG,
                                "EAP-PEAP: Derived key",
                                data->key_data,
                                EAP_TLS_KEY_LEN);
            } else {
                wpa_printf(MSG_DEBUG, "EAP-PEAP: Failed to "
                           "derive key");
            }

            os_free(data->session_id);
            data->session_id =
                eap_peer_tls_derive_session_id(sm, &data->ssl,
                                               EAP_TYPE_PEAP,
                                               &data->id_len);

            if (data->session_id) {
                wpa_hexdump(MSG_DEBUG,
                            "EAP-PEAP: Derived Session-Id",
                            data->session_id, data->id_len);
            } else {
                wpa_printf(MSG_ERROR, "EAP-PEAP: Failed to "
                           "derive Session-Id");
            }

            if (sm->workaround && data->resuming) {
                /*
                 * At least few RADIUS servers (Aegis v1.1.6;
                 * but not v1.1.4; and Cisco ACS) seem to be
                 * terminating PEAPv1 (Aegis) or PEAPv0 (Cisco
                 * ACS) session resumption with outer
                 * EAP-Success. This does not seem to follow
                 * draft-josefsson-pppext-eap-tls-eap-05.txt
                 * section 4.2, so only allow this if EAP
                 * workarounds are enabled.
                 */
                wpa_printf(MSG_DEBUG, "EAP-PEAP: Workaround - "
                           "allow outer EAP-Success to "
                           "terminate PEAP resumption");
                ret->decision = DECISION_COND_SUCC;
                data->phase2_success = 1;
            }

            data->resuming = 0;
        }

        if (res == 2) {
            struct wpabuf msg;
            /*
             * Application data included in the handshake message.
             */
            wpabuf_free(data->pending_phase2_req);
            data->pending_phase2_req = resp;
            resp = NULL;
            wpabuf_set(&msg, pos, left);
            res = eap_peap_decrypt(sm, data, ret, req, &msg,
                                   &resp);
        }
    }

    if (ret->methodState == METHOD_DONE) {
        ret->allowNotifications = FALSE;
    }

    if (res == 1) {
        wpabuf_free(resp);
        return eap_peer_tls_build_ack(id, EAP_TYPE_PEAP,
                                      data->peap_version);
    }

    return resp;
}


static bool
eap_peap_has_reauth_data(struct eap_sm* sm, void* priv)
{
    struct eap_peap_data* data = priv;
    return tls_connection_established(sm->ssl_ctx, data->ssl.conn) &&
           data->phase2_success;
}


static void
eap_peap_deinit_for_reauth(struct eap_sm* sm, void* priv)
{
    struct eap_peap_data* data = priv;
    wpabuf_free(data->pending_phase2_req);
    data->pending_phase2_req = NULL;
    data->crypto_binding_used = 0;
}


static void*
eap_peap_init_for_reauth(struct eap_sm* sm, void* priv)
{
    struct eap_peap_data* data = priv;
    os_free(data->key_data);
    data->key_data = NULL;
    os_free(data->session_id);
    data->session_id = NULL;

    if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
        os_free(data);
        return NULL;
    }

    if (data->phase2_priv && data->phase2_method &&
            data->phase2_method->init_for_reauth) {
        data->phase2_method->init_for_reauth(sm, data->phase2_priv);
    }

    data->phase2_success = 0;
    data->phase2_eap_success = 0;
    data->phase2_eap_started = 0;
    data->resuming = 1;
    data->reauth = 1;
    sm->peap_done = FALSE;
    return priv;
}


static int
eap_peap_get_status(struct eap_sm* sm, void* priv, char* buf,
                    size_t buflen, int verbose)
{
    struct eap_peap_data* data = priv;
    int len, ret;

    len = eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);

    if (data->phase2_method) {
        ret = snprintf(buf + len, buflen - len,
                       "EAP-PEAPv%d Phase2 method=%d\n",
                       data->peap_version,
                       data->phase2_method->method);

        if (ret < 0 || (size_t) ret >= buflen - len) {
            return len;
        }

        len += ret;
    }

    return len;
}


static bool
eap_peap_isKeyAvailable(struct eap_sm* sm, void* priv)
{
    struct eap_peap_data* data = priv;
    return data->key_data != NULL && data->phase2_success;
}


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

    if (data->key_data == NULL || !data->phase2_success) {
        return NULL;
    }

    key = os_malloc(EAP_TLS_KEY_LEN);

    if (key == NULL) {
        return NULL;
    }

    *len = EAP_TLS_KEY_LEN;

    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.
         */
        if (peap_prfplus(data->peap_version, data->ipmk, 40,
                         "Session Key Generating Function",
                         (u8*) "\00", 1, csk, sizeof(csk)) < 0) {
            os_free(key);
            return NULL;
        }

        wpa_hexdump_key(MSG_DEBUG, "EAP-PEAP: CSK", csk, sizeof(csk));
        os_memcpy(key, csk, EAP_TLS_KEY_LEN);
        wpa_hexdump(MSG_DEBUG, "EAP-PEAP: Derived key",
                    key, EAP_TLS_KEY_LEN);
    } else {
        os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
    }

    return key;
}


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

    if (data->session_id == NULL || !data->phase2_success) {
        return NULL;
    }

    id = os_malloc(data->id_len);

    if (id == NULL) {
        return NULL;
    }

    *len = data->id_len;
    os_memcpy(id, data->session_id, data->id_len);

    return id;
}


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

    eap = eap_peer_method_alloc(EAP_VENDOR_IETF, EAP_TYPE_PEAP,
                                "PEAP");

    if (eap == NULL) {
        return -1;
    }

    eap->init = eap_peap_init;
    eap->deinit = eap_peap_deinit;
    eap->process = eap_peap_process;
    eap->isKeyAvailable = eap_peap_isKeyAvailable;
    eap->getKey = eap_peap_getKey;
    eap->get_status = eap_peap_get_status;
    eap->has_reauth_data = eap_peap_has_reauth_data;
    eap->deinit_for_reauth = eap_peap_deinit_for_reauth;
    eap->init_for_reauth = eap_peap_init_for_reauth;
    eap->getSessionId = eap_peap_get_session_id;

    ret = eap_peer_method_register(eap);

    if (ret) {
        eap_peer_method_free(eap);
    }

    return ret;
}

#endif /* EAP_PEAP */