rlm_eap_fast.c

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/*
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or (at
 *   your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
/**
 * $Id: e4e69ff87b6d4a86f9bd4e351bf69c5648d12b0b $
 * @file rlm_eap_fast.c
 * @brief contains the interfaces that are called from eap
 *
 * @author Alexander Clouter (alex@digriz.org.uk)
 *
 * @copyright 2016 Alan DeKok (aland@freeradius.org)
 * @copyright 2016 The FreeRADIUS server project
 */
RCSID("$Id: e4e69ff87b6d4a86f9bd4e351bf69c5648d12b0b $")
USES_APPLE_DEPRECATED_API       /* OpenSSL API has been deprecated by Apple */
 
#include <freeradius-devel/util/md5.h>
#include <freeradius-devel/tls/utils.h>
#include <openssl/rand.h>
#include "eap_fast.h"
#include "eap_fast_crypto.h"
 
typedef struct {
        SSL_CTX         *ssl_ctx;               //!< Thread local SSL_CTX.
} rlm_eap_fast_thread_t;
 
/*
 *      An instance of EAP-FAST
 */
typedef struct {
        char const              *tls_conf_name;                         //!< Name of shared TLS config.
        fr_tls_conf_t           *tls_conf;                              //!< TLS config pointer.
 
        char const              *default_provisioning_method_name;
        int                     default_provisioning_method;
 
        virtual_server_t        *virtual_server;                        //!< Virtual server to use for processing
                                                                        //!< inner EAP method.
        char const              *cipher_list;                           //!< cipher list specific to EAP-FAST
        bool                    req_client_cert;                        //!< Whether we require a client cert
                                                                        //!< in the outer tunnel.
 
        int                     stage;                                  //!< Processing stage.
 
        fr_time_delta_t         pac_lifetime;                           //!< seconds to add to current time to describe PAC lifetime
        char const              *authority_identity;                    //!< The identity we present in the EAP-TLS
        uint8_t                 a_id[PAC_A_ID_LENGTH];                  //!< The identity we present in the EAP-TLS
        char const              *pac_opaque_key;                        //!< The key used to encrypt PAC-Opaque
} rlm_eap_fast_t;
 
 
static conf_parser_t submodule_config[] = {
        { FR_CONF_OFFSET("tls", rlm_eap_fast_t, tls_conf_name) },
 
        { FR_CONF_OFFSET("default_provisioning_eap_type", rlm_eap_fast_t, default_provisioning_method_name), .dflt = "mschapv2" },
 
        { FR_CONF_OFFSET_TYPE_FLAGS("virtual_server", FR_TYPE_VOID, CONF_FLAG_REQUIRED | CONF_FLAG_NOT_EMPTY, rlm_eap_fast_t, virtual_server),
                                    .func = virtual_server_cf_parse,
                                    .uctx = &(virtual_server_cf_parse_uctx_t){ .process_module_name = "eap_fast"} },
 
        { FR_CONF_OFFSET("cipher_list", rlm_eap_fast_t, cipher_list) },
 
        { FR_CONF_OFFSET("require_client_cert", rlm_eap_fast_t, req_client_cert), .dflt = "no" },
 
        { FR_CONF_OFFSET("pac_lifetime", rlm_eap_fast_t, pac_lifetime), .dflt = "604800" },
        { FR_CONF_OFFSET_FLAGS("authority_identity", CONF_FLAG_REQUIRED, rlm_eap_fast_t, authority_identity) },
        { FR_CONF_OFFSET_FLAGS("pac_opaque_key", CONF_FLAG_REQUIRED, rlm_eap_fast_t, pac_opaque_key) },
 
        CONF_PARSER_TERMINATOR
};
 
static fr_dict_t const *dict_freeradius;
static fr_dict_t const *dict_radius;
static fr_dict_t const *dict_eap_fast;
 
extern fr_dict_autoload_t rlm_eap_fast_dict[];
fr_dict_autoload_t rlm_eap_fast_dict[] = {
        { .out = &dict_freeradius, .proto = "freeradius" },
        { .out = &dict_radius, .proto = "radius" },
        { .out = &dict_eap_fast, .base_dir = "eap/fast", .proto = "eap-fast" },
        DICT_AUTOLOAD_TERMINATOR
};
 
static fr_dict_attr_t const *attr_eap_emsk;
static fr_dict_attr_t const *attr_eap_msk;
static fr_dict_attr_t const *attr_eap_tls_require_client_cert;
static fr_dict_attr_t const *attr_eap_type;
static fr_dict_attr_t const *attr_ms_chap_challenge;
static fr_dict_attr_t const *attr_ms_chap_peer_challenge;
static fr_dict_attr_t const *attr_proxy_to_realm;
 
static fr_dict_attr_t const *attr_eap_message;
static fr_dict_attr_t const *attr_freeradius_proxied_to;
static fr_dict_attr_t const *attr_ms_mppe_send_key;
static fr_dict_attr_t const *attr_ms_mppe_recv_key;
static fr_dict_attr_t const *attr_user_name;
static fr_dict_attr_t const *attr_user_password;
 
static fr_dict_attr_t const *attr_eap_fast_crypto_binding;
static fr_dict_attr_t const *attr_eap_fast_eap_payload;
static fr_dict_attr_t const *attr_eap_fast_error;
static fr_dict_attr_t const *attr_eap_fast_intermediate_result;
static fr_dict_attr_t const *attr_eap_fast_nak;
static fr_dict_attr_t const *attr_eap_fast_pac_a_id;
static fr_dict_attr_t const *attr_eap_fast_pac_a_id_info;
static fr_dict_attr_t const *attr_eap_fast_pac_acknowledge;
static fr_dict_attr_t const *attr_eap_fast_pac_i_id;
static fr_dict_attr_t const *attr_eap_fast_pac_info_a_id;
static fr_dict_attr_t const *attr_eap_fast_pac_info_a_id_info;
static fr_dict_attr_t const *attr_eap_fast_pac_info_i_id;
static fr_dict_attr_t const *attr_eap_fast_pac_info_pac_lifetime;
static fr_dict_attr_t const *attr_eap_fast_pac_info_pac_type;
static fr_dict_attr_t const *attr_eap_fast_pac_info_tlv;
static fr_dict_attr_t const *attr_eap_fast_pac_key;
static fr_dict_attr_t const *attr_eap_fast_pac_lifetime;
static fr_dict_attr_t const *attr_eap_fast_pac_opaque_i_id;
static fr_dict_attr_t const *attr_eap_fast_pac_opaque_pac_key;
static fr_dict_attr_t const *attr_eap_fast_pac_opaque_pac_lifetime;
static fr_dict_attr_t const *attr_eap_fast_pac_opaque_pac_type;
static fr_dict_attr_t const *attr_eap_fast_pac_opaque_tlv;
static fr_dict_attr_t const *attr_eap_fast_pac_tlv;
static fr_dict_attr_t const *attr_eap_fast_pac_type;
static fr_dict_attr_t const *attr_eap_fast_result;
static fr_dict_attr_t const *attr_eap_fast_vendor_specific;
 
extern fr_dict_attr_autoload_t rlm_eap_fast_dict_attr[];
fr_dict_attr_autoload_t rlm_eap_fast_dict_attr[] = {
        { .out = &attr_eap_emsk, .name = "EAP-EMSK", .type = FR_TYPE_OCTETS, .dict = &dict_freeradius },
        { .out = &attr_eap_msk, .name = "EAP-MSK", .type = FR_TYPE_OCTETS, .dict = &dict_freeradius },
        { .out = &attr_eap_tls_require_client_cert, .name = "EAP-TLS-Require-Client-Cert", .type = FR_TYPE_UINT32, .dict = &dict_freeradius },
        { .out = &attr_eap_type, .name = "EAP-Type", .type = FR_TYPE_UINT32, .dict = &dict_freeradius },
        { .out = &attr_ms_chap_challenge, .name = "Vendor-Specific.Microsoft.CHAP-Challenge", .type = FR_TYPE_OCTETS, .dict = &dict_radius },
        { .out = &attr_ms_chap_peer_challenge, .name = "MS-CHAP-Peer-Challenge", .type = FR_TYPE_OCTETS, .dict = &dict_freeradius },
        { .out = &attr_proxy_to_realm, .name = "Proxy-To-Realm", .type = FR_TYPE_STRING, .dict = &dict_freeradius },
 
        { .out = &attr_eap_message, .name = "EAP-Message", .type = FR_TYPE_OCTETS, .dict = &dict_radius },
        { .out = &attr_freeradius_proxied_to, .name = "Vendor-Specific.FreeRADIUS.Proxied-To", .type = FR_TYPE_IPV4_ADDR, .dict = &dict_radius },
        { .out = &attr_ms_mppe_send_key, .name = "Vendor-Specific.Microsoft.MPPE-Send-Key", .type = FR_TYPE_OCTETS, .dict = &dict_radius },
        { .out = &attr_ms_mppe_recv_key, .name = "Vendor-Specific.Microsoft.MPPE-Recv-Key", .type = FR_TYPE_OCTETS, .dict = &dict_radius },
        { .out = &attr_user_name, .name = "User-Name", .type = FR_TYPE_STRING, .dict = &dict_radius },
        { .out = &attr_user_password, .name = "User-Password", .type = FR_TYPE_STRING, .dict = &dict_radius },
 
        { .out = &attr_eap_fast_crypto_binding, .name = "Crypto-Binding", .type = FR_TYPE_OCTETS, .dict = &dict_eap_fast },
        { .out = &attr_eap_fast_eap_payload, .name = "EAP-Payload", .type = FR_TYPE_OCTETS, .dict = &dict_eap_fast },
        { .out = &attr_eap_fast_error, .name = "Error", .type = FR_TYPE_UINT32, .dict = &dict_eap_fast },
        { .out = &attr_eap_fast_intermediate_result, .name = "Intermediate-Result", .type = FR_TYPE_OCTETS, .dict = &dict_eap_fast },
        { .out = &attr_eap_fast_nak, .name = "NAK", .type = FR_TYPE_OCTETS, .dict = &dict_eap_fast },
        { .out = &attr_eap_fast_pac_a_id, .name = "PAC.A-ID", .type = FR_TYPE_OCTETS, .dict = &dict_eap_fast },
        { .out = &attr_eap_fast_pac_a_id_info, .name = "PAC.A-ID-Info", .type = FR_TYPE_OCTETS, .dict = &dict_eap_fast },
        { .out = &attr_eap_fast_pac_acknowledge, .name = "PAC.Acknowledge", .type = FR_TYPE_UINT16, .dict = &dict_eap_fast },
        { .out = &attr_eap_fast_pac_i_id, .name = "PAC.I-ID", .type = FR_TYPE_OCTETS, .dict = &dict_eap_fast },
        { .out = &attr_eap_fast_pac_info_a_id, .name = "PAC.Info.A-ID", .type = FR_TYPE_OCTETS, .dict = &dict_eap_fast },
        { .out = &attr_eap_fast_pac_info_a_id_info, .name = "PAC.Info.A-ID-Info", .type = FR_TYPE_OCTETS, .dict = &dict_eap_fast },
        { .out = &attr_eap_fast_pac_info_i_id, .name = "PAC.Info.I-ID", .type = FR_TYPE_OCTETS, .dict = &dict_eap_fast },
        { .out = &attr_eap_fast_pac_info_pac_lifetime, .name = "PAC.Info.PAC-Lifetime", .type = FR_TYPE_UINT32, .dict = &dict_eap_fast },
        { .out = &attr_eap_fast_pac_info_pac_type, .name = "PAC.Info.PAC-Type", .type = FR_TYPE_UINT16, .dict = &dict_eap_fast },
        { .out = &attr_eap_fast_pac_info_tlv, .name = "PAC.Info", .type = FR_TYPE_TLV, .dict = &dict_eap_fast },
        { .out = &attr_eap_fast_pac_key, .name = "PAC.Key", .type = FR_TYPE_OCTETS, .dict = &dict_eap_fast },
        { .out = &attr_eap_fast_pac_lifetime, .name = "PAC.Lifetime", .type = FR_TYPE_UINT32, .dict = &dict_eap_fast },
        { .out = &attr_eap_fast_pac_opaque_i_id, .name = "PAC.Opaque.I-ID", .type = FR_TYPE_OCTETS, .dict = &dict_eap_fast },
        { .out = &attr_eap_fast_pac_opaque_pac_key, .name = "PAC.Opaque.PAC-Key", .type = FR_TYPE_OCTETS, .dict = &dict_eap_fast },
        { .out = &attr_eap_fast_pac_opaque_pac_lifetime, .name = "PAC.Opaque.PAC-Lifetime", .type = FR_TYPE_UINT32, .dict = &dict_eap_fast },
        { .out = &attr_eap_fast_pac_opaque_pac_type, .name = "PAC.Opaque.PAC-Type", .type = FR_TYPE_UINT16, .dict = &dict_eap_fast },
        { .out = &attr_eap_fast_pac_opaque_tlv, .name = "PAC.Opaque", .type = FR_TYPE_TLV, .dict = &dict_eap_fast },
        { .out = &attr_eap_fast_pac_tlv, .name = "PAC", .type = FR_TYPE_TLV, .dict = &dict_eap_fast },
        { .out = &attr_eap_fast_pac_type, .name = "PAC.Type", .type = FR_TYPE_UINT16, .dict = &dict_eap_fast },
        { .out = &attr_eap_fast_result, .name = "Result", .type = FR_TYPE_UINT16, .dict = &dict_eap_fast },
        { .out = &attr_eap_fast_vendor_specific, .name = "Vendor-Specific", .type = FR_TYPE_OCTETS, .dict = &dict_eap_fast },
 
        DICT_AUTOLOAD_TERMINATOR
};
 
#define RANDFILL(x) do { fr_assert(sizeof(x) % sizeof(uint32_t) == 0); for (size_t i = 0; i < sizeof(x); i += sizeof(uint32_t)) *((uint32_t *)&x[i]) = fr_rand(); } while(0)
 
/**
 * RFC 4851 section 5.1 - EAP-FAST Authentication Phase 1: Key Derivations
 */
static void eap_fast_init_keys(request_t *request, fr_tls_session_t *tls_session)
{
        eap_fast_tunnel_t *t = talloc_get_type_abort(tls_session->opaque, eap_fast_tunnel_t);
        uint8_t *buf;
        uint8_t *scratch;
        size_t ksize;
 
        RDEBUG2("Deriving EAP-FAST keys");
 
        fr_assert(t->s_imck == NULL);
 
        ksize = fr_tls_utils_keyblock_size_get(request, tls_session->ssl);
        fr_assert(ksize > 0);
        buf = talloc_array(request, uint8_t, ksize + sizeof(*t->keyblock));
        scratch = talloc_array(request, uint8_t, ksize + sizeof(*t->keyblock));
 
        t->keyblock = talloc(t, eap_fast_keyblock_t);
 
        eap_fast_tls_gen_challenge(tls_session->ssl, buf, scratch, ksize + sizeof(*t->keyblock), "key expansion");
        memcpy(t->keyblock, &buf[ksize], sizeof(*t->keyblock));
        memset(buf, 0, ksize + sizeof(*t->keyblock));
 
        t->s_imck = talloc_array(t, uint8_t, EAP_FAST_SIMCK_LEN);
        memcpy(t->s_imck, t->keyblock, EAP_FAST_SKS_LEN);       /* S-IMCK[0] = session_key_seed */
 
        t->cmk = talloc_array(t, uint8_t, EAP_FAST_CMK_LEN);    /* note that CMK[0] is not defined */
        t->imck_count = 0;
 
        talloc_free(buf);
        talloc_free(scratch);
}
 
/**
 * RFC 4851 section 5.2 - Intermediate Compound Key Derivations
 */
static void eap_fast_update_icmk(request_t *request, fr_tls_session_t *tls_session, uint8_t *msk)
{
        eap_fast_tunnel_t *t = talloc_get_type_abort(tls_session->opaque, eap_fast_tunnel_t);
        uint8_t imck[EAP_FAST_SIMCK_LEN + EAP_FAST_CMK_LEN];
 
        RDEBUG2("Updating ICMK");
 
        T_PRF(t->s_imck, EAP_FAST_SIMCK_LEN, "Inner Methods Compound Keys", msk, 32, imck, sizeof(imck));       //-V512
 
        memcpy(t->s_imck, imck, EAP_FAST_SIMCK_LEN);
        RHEXDUMP3(t->s_imck, EAP_FAST_SIMCK_LEN, "S-IMCK[j]");
 
        memcpy(t->cmk, &imck[EAP_FAST_SIMCK_LEN], EAP_FAST_CMK_LEN);
        RHEXDUMP3(t->cmk, EAP_FAST_CMK_LEN, "CMK[j]");
 
        t->imck_count++;
 
        /*
         * Calculate MSK/EMSK at the same time as they are coupled to ICMK
         *
         * RFC 4851 section 5.4 - EAP Master Session Key Generation
         */
        t->msk = talloc_array(t, uint8_t, EAP_FAST_KEY_LEN);
        T_PRF(t->s_imck, EAP_FAST_SIMCK_LEN, "Session Key Generating Function", NULL, 0, t->msk, EAP_FAST_KEY_LEN);
        RHEXDUMP3(t->msk, EAP_FAST_KEY_LEN, "MSK");
 
        t->emsk = talloc_array(t, uint8_t, EAP_EMSK_LEN);
        T_PRF(t->s_imck, EAP_FAST_SIMCK_LEN, "Extended Session Key Generating Function", NULL, 0, t->emsk, EAP_EMSK_LEN);
        RHEXDUMP3(t->emsk, EAP_EMSK_LEN, "EMSK");
}
 
static void eap_fast_tlv_append(fr_tls_session_t *tls_session, fr_dict_attr_t const *tlv, bool mandatory, int length, void const *data)
{
        uint16_t hdr[2];
 
        hdr[0] = (mandatory) ? htons(tlv->attr | EAP_FAST_TLV_MANDATORY) : htons(tlv->attr);
        hdr[1] = htons(length);
 
        tls_session->record_from_buff(&tls_session->clean_in, &hdr, 4);
        tls_session->record_from_buff(&tls_session->clean_in, data, length);
}
 
static void eap_fast_send_error(fr_tls_session_t *tls_session, int error)
{
        uint32_t value;
        value = htonl(error);
 
        eap_fast_tlv_append(tls_session, attr_eap_fast_error, true, sizeof(value), &value);
}
 
static void eap_fast_append_result(fr_tls_session_t *tls_session, fr_radius_packet_code_t code)
{
        eap_fast_tunnel_t       *t = talloc_get_type_abort(tls_session->opaque, eap_fast_tunnel_t);
        uint16_t                state;
        fr_dict_attr_t const    *da;
 
 
        da = (t->result_final) ? attr_eap_fast_result : attr_eap_fast_intermediate_result;
        state = htons((code == FR_RADIUS_CODE_ACCESS_REJECT) ? EAP_FAST_TLV_RESULT_FAILURE : EAP_FAST_TLV_RESULT_SUCCESS);
 
        eap_fast_tlv_append(tls_session, da, true, sizeof(state), &state);
}
 
static void eap_fast_send_identity_request(request_t *request, fr_tls_session_t *tls_session, eap_session_t *eap_session)
{
        eap_packet_hdr_t eap_packet;
 
        RDEBUG2("Sending EAP-Identity");
 
        eap_packet.code = FR_EAP_CODE_REQUEST;
        eap_packet.id = eap_session->this_round->response->id + 1;
        eap_packet.length[0] = 0;
        eap_packet.length[1] = EAP_HEADER_LEN + 1;
        eap_packet.data[0] = FR_EAP_METHOD_IDENTITY;
 
        eap_fast_tlv_append(tls_session, attr_eap_fast_eap_payload, true, sizeof(eap_packet), &eap_packet);
}
 
static void eap_fast_send_pac_tunnel(request_t *request, fr_tls_session_t *tls_session)
{
        eap_fast_tunnel_t                       *t = talloc_get_type_abort(tls_session->opaque, eap_fast_tunnel_t);
        eap_fast_pac_t                          pac;
        eap_fast_attr_pac_opaque_plaintext_t    opaque_plaintext;
        int                                     alen, dlen;
 
        memset(&pac, 0, sizeof(pac));
        memset(&opaque_plaintext, 0, sizeof(opaque_plaintext));
 
        RDEBUG2("Sending Tunnel PAC");
 
        pac.key.hdr.type = htons(EAP_FAST_TLV_MANDATORY | attr_eap_fast_pac_key->attr);
        pac.key.hdr.length = htons(sizeof(pac.key.data));
        fr_assert(sizeof(pac.key.data) % sizeof(uint32_t) == 0);
        RANDFILL(pac.key.data);
 
        pac.info.lifetime.hdr.type = htons(attr_eap_fast_pac_info_pac_lifetime->attr);
        pac.info.lifetime.hdr.length = htons(sizeof(pac.info.lifetime.data));
        pac.info.lifetime.data = htonl(fr_time_to_sec(fr_time_add(request->packet->timestamp, t->pac_lifetime)));
 
        pac.info.a_id.hdr.type = htons(EAP_FAST_TLV_MANDATORY | attr_eap_fast_pac_a_id->attr);
        pac.info.a_id.hdr.length = htons(sizeof(pac.info.a_id.data));
        memcpy(pac.info.a_id.data, t->a_id, sizeof(pac.info.a_id.data));
 
        pac.info.a_id_info.hdr.type = htons(attr_eap_fast_pac_a_id->attr);
        pac.info.a_id_info.hdr.length = htons(sizeof(pac.info.a_id_info.data));
 
#define MIN(a,b) (((a)>(b)) ? (b) : (a))
        alen = MIN(talloc_strlen(t->authority_identity), sizeof(pac.info.a_id_info.data));
        memcpy(pac.info.a_id_info.data, t->authority_identity, alen);
 
        pac.info.type.hdr.type = htons(EAP_FAST_TLV_MANDATORY | attr_eap_fast_pac_info_pac_type->attr);
        pac.info.type.hdr.length = htons(sizeof(pac.info.type.data));
        pac.info.type.data = htons(PAC_TYPE_TUNNEL);
 
        pac.info.hdr.type = htons(EAP_FAST_TLV_MANDATORY | attr_eap_fast_pac_info_tlv->attr);
        pac.info.hdr.length = htons(sizeof(pac.info.lifetime)
                                + sizeof(pac.info.a_id)
                                + sizeof(pac.info.a_id_info)
                                + sizeof(pac.info.type));
 
        memcpy(&opaque_plaintext.type, &pac.info.type, sizeof(opaque_plaintext.type));
        memcpy(&opaque_plaintext.lifetime, &pac.info.lifetime, sizeof(opaque_plaintext.lifetime));
        memcpy(&opaque_plaintext.key, &pac.key, sizeof(opaque_plaintext.key));
 
        RHEXDUMP3((uint8_t const *)&opaque_plaintext, sizeof(opaque_plaintext), "PAC-Opaque plaintext data section");
 
        fr_assert(PAC_A_ID_LENGTH <= EVP_GCM_TLS_TAG_LEN);
        memcpy(pac.opaque.aad, t->a_id, PAC_A_ID_LENGTH);
        fr_assert(RAND_bytes(pac.opaque.iv, sizeof(pac.opaque.iv)) != 0);
        dlen = eap_fast_encrypt((unsigned const char *)&opaque_plaintext, sizeof(opaque_plaintext),
                                    t->a_id, PAC_A_ID_LENGTH, t->pac_opaque_key, pac.opaque.iv,
                                    pac.opaque.data, pac.opaque.tag);
 
        pac.opaque.hdr.type = htons(EAP_FAST_TLV_MANDATORY | attr_eap_fast_pac_opaque_tlv->attr);
        pac.opaque.hdr.length = htons(sizeof(pac.opaque) - sizeof(pac.opaque.hdr) - sizeof(pac.opaque.data) + dlen);
        RHEXDUMP3((uint8_t const *)&pac.opaque, sizeof(pac.opaque) - sizeof(pac.opaque.data) + dlen, "PAC-Opaque");
 
        eap_fast_tlv_append(tls_session, attr_eap_fast_pac_tlv, true, sizeof(pac) - sizeof(pac.opaque.data) + dlen, &pac);
}
 
static void eap_fast_append_crypto_binding(request_t *request, fr_tls_session_t *tls_session)
{
        eap_fast_tunnel_t               *t = talloc_get_type_abort(tls_session->opaque, eap_fast_tunnel_t);
        eap_tlv_crypto_binding_tlv_t    binding = {0};
        int const                       len = sizeof(binding) - (&binding.reserved - (uint8_t *)&binding);
 
        RDEBUG2("Sending Cryptobinding");
 
        binding.tlv_type = htons(EAP_FAST_TLV_MANDATORY | attr_eap_fast_crypto_binding->attr);
        binding.length = htons(len);
        binding.version = EAP_FAST_VERSION;
        binding.received_version = EAP_FAST_VERSION;    /* FIXME use the clients value */
        binding.subtype = EAP_FAST_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST;
 
        fr_assert(sizeof(binding.nonce) % sizeof(uint32_t) == 0);
        RANDFILL(binding.nonce);
        binding.nonce[sizeof(binding.nonce) - 1] &= ~0x01; /* RFC 4851 section 4.2.8 */
        RHEXDUMP3(binding.nonce, sizeof(binding.nonce), "NONCE");
 
        RHEXDUMP3((uint8_t const *) &binding, sizeof(binding), "Crypto-Binding TLV for Compound MAC calculation");
 
        fr_hmac_sha1(binding.compound_mac, (uint8_t *)&binding, sizeof(binding), t->cmk, EAP_FAST_CMK_LEN);
        RHEXDUMP3(binding.compound_mac, sizeof(binding.compound_mac), "Compound MAC");
 
        eap_fast_tlv_append(tls_session, attr_eap_fast_crypto_binding, true, len, &binding.reserved);
}
 
#define EAP_FAST_TLV_MAX 13
 
static int eap_fast_verify(request_t *request, fr_tls_session_t *tls_session, uint8_t const *data, unsigned int data_len)
{
        uint16_t attr;
        uint16_t length;
        unsigned int remaining = data_len;
        int     total = 0;
        int     num[EAP_FAST_TLV_MAX + 1] = {0};
        eap_fast_tunnel_t *t = talloc_get_type_abort(tls_session->opaque, eap_fast_tunnel_t);
        uint32_t present = 0;
 
        fr_assert(sizeof(present) * 8 > EAP_FAST_TLV_MAX);
 
        while (remaining > 0) {
                if (remaining < 4) {
                        RDEBUG2("EAP-FAST TLV is too small (%u) to contain a EAP-FAST TLV header", remaining);
                        return 0;
                }
 
                memcpy(&attr, data, sizeof(attr));
                attr = ntohs(attr) & EAP_FAST_TLV_TYPE;
 
                if ((attr == attr_eap_fast_result->attr) ||
                    (attr == attr_eap_fast_nak->attr) ||
                    (attr == attr_eap_fast_error->attr) ||
                    (attr == attr_eap_fast_vendor_specific->attr) ||
                    (attr == attr_eap_fast_eap_payload->attr) ||
                    (attr == attr_eap_fast_intermediate_result->attr) ||
                    (attr == attr_eap_fast_pac_tlv->attr) ||
                    (attr == attr_eap_fast_crypto_binding->attr)) {
                        num[attr]++;
                        present |= 1 << attr;
 
                        if (num[attr_eap_fast_eap_payload->attr] > 1) {
                                REDEBUG("Too many EAP-Payload TLVs");
unexpected:
                                for (int i = 0; i < EAP_FAST_TLV_MAX; i++) {
                                        if (present & (1 << i)) RDEBUG2(" - attribute %d is present", i);
                                }
                                eap_fast_send_error(tls_session, EAP_FAST_ERR_UNEXPECTED_TLV);
                                return 0;
                        }
 
                        if (num[attr_eap_fast_intermediate_result->attr] > 1) {
                                REDEBUG("Too many Intermediate-Result TLVs");
                                goto unexpected;
                        }
                } else {
                        if ((data[0] & 0x80) != 0) {
                                REDEBUG("Unknown mandatory TLV %02x", attr);
                                goto unexpected;
                        }
 
                        num[0]++;
                }
 
                total++;
 
                memcpy(&length, data + 2, sizeof(length));
                length = ntohs(length);
 
                data += 4;
                remaining -= 4;
 
                if (length > remaining) {
                        RDEBUG2("EAP-FAST TLV %u is longer than room remaining in the packet (%u > %u).", attr,
                                length, remaining);
                        return 0;
                }
 
                /*
                 * If the rest of the TLVs are larger than
                 * this attribute, continue.
                 *
                 * Otherwise, if the attribute over-flows the end
                 * of the TLCs, die.
                 */
                if (remaining < length) {
                        RDEBUG2("EAP-FAST TLV overflows packet!");
                        return 0;
                }
 
                /*
                 * If there's an error, we bail out of the
                 * authentication process before allocating
                 * memory.
                 */
                if ((attr == attr_eap_fast_intermediate_result->attr) || (attr == attr_eap_fast_result->attr)) {
                        uint16_t status;
 
                        if (length < 2) {
                                REDEBUG("EAP-FAST TLV %u is too short.  Expected 2, got %d", attr, length);
                                return 0;
                        }
 
                        memcpy(&status, data, 2);
                        status = ntohs(status);
 
                        if (status == EAP_FAST_TLV_RESULT_FAILURE) {
                                REDEBUG("EAP-FAST TLV %u indicates failure.  Rejecting request", attr);
                                return 0;
                        }
 
                        if (status != EAP_FAST_TLV_RESULT_SUCCESS) {
                                REDEBUG("EAP-FAST TLV %u contains unknown value.  Rejecting request", attr);
                                goto unexpected;
                        }
                }
 
                /*
                 * remaining > length, continue.
                 */
                remaining -= length;
                data += length;
        }
 
        /*
         * Check if the peer mixed & matched TLVs.
         */
        if ((num[attr_eap_fast_nak->attr] > 0) && (num[attr_eap_fast_nak->attr] != total)) {
                REDEBUG("NAK TLV sent with non-NAK TLVs.  Rejecting request");
                goto unexpected;
        }
 
        /*
         * Check mandatory or not mandatory TLVs.
         */
        switch (t->stage) {
        case EAP_FAST_TLS_SESSION_HANDSHAKE:
                if (present) {
                        REDEBUG("Unexpected TLVs in TLS Session Handshake stage");
                        goto unexpected;
                }
                break;
        case EAP_FAST_AUTHENTICATION:
                if (present != (uint32_t)(1 << attr_eap_fast_eap_payload->attr)) {
                        REDEBUG("Unexpected TLVs in authentication stage");
                        goto unexpected;
                }
                break;
        case EAP_FAST_CRYPTOBIND_CHECK:
        {
                uint32_t bits = (t->result_final)
                                ? 1 << attr_eap_fast_result->attr
                                : 1 << attr_eap_fast_intermediate_result->attr;
                if (present & ~(bits | (1 << attr_eap_fast_crypto_binding->attr) | (1 << attr_eap_fast_pac_tlv->attr))) {
                        REDEBUG("Unexpected TLVs in cryptobind checking stage");
                        goto unexpected;
                }
                break;
        }
        case EAP_FAST_PROVISIONING:
                if (present & ~((1 << attr_eap_fast_pac_tlv->attr) | (1 << attr_eap_fast_result->attr))) {
                        REDEBUG("Unexpected TLVs in provisioning stage");
                        goto unexpected;
                }
                break;
        case EAP_FAST_COMPLETE:
                if (present) {
                        REDEBUG("Unexpected TLVs in complete stage");
                        goto unexpected;
                }
                break;
        default:
                REDEBUG("Unexpected stage %d", t->stage);
                return 0;
        }
 
        /*
         * We got this far.  It looks OK.
         */
        return 1;
}
 
/**
 *
 * FIXME do something with mandatory
 */
static ssize_t eap_fast_decode_pair(TALLOC_CTX *ctx, fr_pair_list_t *out, fr_dict_attr_t const *parent,
                                    uint8_t const *data, size_t data_len,
                                    void *decode_ctx)
{
        fr_dict_attr_t const    *da;
        uint8_t const           *p = data, *end = p + data_len;
 
        /*
         *      Decode the TLVs
         */
        while (p < end) {
                ssize_t         ret;
                uint16_t        attr;
                uint16_t        len;
                fr_pair_t       *vp;
 
                attr = fr_nbo_to_uint16(p) & EAP_FAST_TLV_TYPE;
                p += 2;
                len = fr_nbo_to_uint16(p);
                p += 2;
 
                da = fr_dict_attr_child_by_num(parent, attr);
                if (!da) {
                        MEM(vp = fr_pair_afrom_child_num(ctx, parent, attr));
 
                } else if (da->type == FR_TYPE_TLV) {
                        p += (size_t) eap_fast_decode_pair(ctx, out, parent, p, len, decode_ctx);
                        continue;
 
                } else {
                        MEM(vp = fr_pair_afrom_da(ctx, da));
                }
 
                ret = fr_value_box_from_network(vp, &vp->data, vp->vp_type, vp->da,
                                                &FR_DBUFF_TMP(p, (size_t)len), len, true);
                if (ret != len) {
                        fr_pair_raw_afrom_pair(vp, p, len);
                }
                fr_pair_append(out, vp);
                p += len;
        }
 
        return p - data;
}
 
 
/*
 * Use a reply packet to determine what to do.
 */
static rlm_rcode_t CC_HINT(nonnull) process_reply(UNUSED eap_session_t *eap_session,
                                                  fr_tls_session_t *tls_session,
                                                  request_t *request,
                                                  fr_packet_t *reply, fr_pair_list_t *reply_list)
{
        rlm_rcode_t                     rcode = RLM_MODULE_REJECT;
        fr_pair_t                       *vp;
        fr_dcursor_t                    cursor;
 
        eap_fast_tunnel_t               *t = talloc_get_type_abort(tls_session->opaque, eap_fast_tunnel_t);
 
        /*
         * If the response packet was Access-Accept, then
         * we're OK.  If not, die horribly.
         *
         * FIXME: EAP-Messages can only start with 'identity',
         * NOT 'eap start', so we should check for that....
         */
        switch (reply->code) {
        case FR_RADIUS_CODE_ACCESS_ACCEPT:
                rcode = RLM_MODULE_OK;
 
                /*
                 * Copy what we need into the TTLS tunnel and leave
                 * the rest to be cleaned up.
                 */
                for (vp = fr_pair_list_head(reply_list); vp; vp = fr_pair_list_next(reply_list, vp)) {
                        if (fr_dict_vendor_num_by_da(vp->da) != VENDORPEC_MICROSOFT) continue;
 
                        /* FIXME must be a better way to capture/re-derive this later for ISK */
                        switch (vp->da->attr) {
                        case FR_MSCHAP_MPPE_SEND_KEY:
                                if (vp->vp_length != MD5_DIGEST_LENGTH) {
                                wrong_length:
                                        REDEBUG("Found %s with incorrect length.  Expected %u, got %zu",
                                                vp->da->name, MD5_DIGEST_LENGTH, vp->vp_length);
                                        rcode = RLM_MODULE_INVALID;
                                        break;
                                }
 
                                memcpy(t->isk.mppe_send, vp->vp_octets, MD5_DIGEST_LENGTH);
                                break;
 
                        case FR_MSCHAP_MPPE_RECV_KEY:
                                if (vp->vp_length != MD5_DIGEST_LENGTH) goto wrong_length;
                                memcpy(t->isk.mppe_recv, vp->vp_octets, MD5_DIGEST_LENGTH);
                                break;
 
                        case FR_MSCHAP2_SUCCESS:
                                RDEBUG2("Got %s, tunneling it to the client in a challenge", vp->da->name);
                                rcode = RLM_MODULE_HANDLED;
                                t->authenticated = true;
                                break;
 
                        default:
                                break;
                        }
                }
                RHEXDUMP3((uint8_t *)&t->isk, 2 * MD5_DIGEST_LENGTH, "ISK[j]"); /* FIXME (part of above) */
                break;
 
        case FR_RADIUS_CODE_ACCESS_REJECT:
                rcode = RLM_MODULE_REJECT;
                break;
 
        case FR_RADIUS_CODE_ACCESS_CHALLENGE:
                /*
                 *      Copy the EAP-Message back to the tunnel.
                 */
 
                for (vp = fr_pair_dcursor_by_da_init(&cursor, reply_list, attr_eap_message);
                     vp;
                     vp = fr_dcursor_next(&cursor)) {
                        eap_fast_tlv_append(tls_session, attr_eap_fast_eap_payload, true, vp->vp_length, vp->vp_octets);
                }
 
                rcode = RLM_MODULE_HANDLED;
                break;
 
        default:
                REDEBUG("Unknown RADIUS packet type %d: rejecting tunneled user", reply->code);
                rcode = RLM_MODULE_INVALID;
                break;
        }
 
        return rcode;
}
 
static fr_radius_packet_code_t eap_fast_eap_payload(request_t *request, module_ctx_t const *mctx, eap_session_t *eap_session,
                                    fr_tls_session_t *tls_session, fr_pair_t *tlv_eap_payload)
{
        fr_radius_packet_code_t         code = FR_RADIUS_CODE_ACCESS_REJECT;
        rlm_rcode_t                     rcode;
        fr_pair_t                       *vp;
        eap_fast_tunnel_t               *t;
        request_t                       *fake;
        rlm_eap_fast_t                  *inst = talloc_get_type_abort(mctx->mi->data, rlm_eap_fast_t);
 
        RDEBUG2("Processing received EAP Payload");
 
        /*
         *      Allocate a fake request_t structure.
         */
        fake = request_local_alloc_internal(request, &(request_init_args_t){ .parent = request });
        fr_assert(fr_pair_list_empty(&fake->request_pairs));
 
        t = talloc_get_type_abort(tls_session->opaque, eap_fast_tunnel_t);
 
        /*
         *      Add the tunneled attributes to the fake request.
         */
 
        /*
         *      Tell the request that it's a fake one.
         */
        MEM(fr_pair_prepend_by_da(fake->request_ctx, &vp, &fake->request_pairs, attr_freeradius_proxied_to) >= 0);
        (void)fr_pair_value_from_str(vp, "127.0.0.1", sizeof("127.0.0.1") - 1, NULL, false);
 
        /*
         *      Add EAP-Message after other attributes, as VP is used below.
         */
        MEM(vp = fr_pair_afrom_da(fake->request_ctx, attr_eap_message));
        fr_pair_append(&fake->request_pairs, vp);
        fr_pair_value_memdup(vp, tlv_eap_payload->vp_octets, tlv_eap_payload->vp_length, false);
 
        RDEBUG2("Got tunneled request");
        log_request_pair_list(L_DBG_LVL_1, fake, NULL, &fake->request_pairs, NULL);
 
        /*
         *      If there's no User-Name in the stored data, look for
         *      an EAP-Identity, and pull it out of there.
         */
        if (!t->username) {
                fr_assert(vp->da == attr_eap_message); /* cached from above */
 
                if ((vp->vp_length >= EAP_HEADER_LEN + 2) &&
                    (vp->vp_strvalue[0] == FR_EAP_CODE_RESPONSE) &&
                    (vp->vp_strvalue[EAP_HEADER_LEN] == FR_EAP_METHOD_IDENTITY) &&
                    (vp->vp_strvalue[EAP_HEADER_LEN + 1] != 0)) {
                        /*
                         *      Create and remember a User-Name
                         */
                        MEM(t->username = fr_pair_afrom_da(t, attr_user_name));
                        t->username->vp_tainted = true;
                        fr_pair_value_bstrndup(t->username, (char const *)vp->vp_octets + 5, vp->vp_length - 5, true);
 
                        RDEBUG2("Got tunneled identity of %pV", &t->username->data);
                } else {
                        /*
                         * Don't reject the request outright,
                         * as it's permitted to do EAP without
                         * user-name.
                         */
                        RWDEBUG2("No EAP-Identity found to start EAP conversation");
                }
        } /* else there WAS a t->username */
 
        if (t->username) {
                MEM(vp = fr_pair_copy(fake->request_ctx, t->username));
                fr_pair_append(&fake->request_pairs, vp);
        }
 
        if (t->stage == EAP_FAST_AUTHENTICATION) {      /* FIXME do this only for MSCHAPv2 */
                fr_pair_t *tvp;
 
                MEM(tvp = fr_pair_afrom_da(fake, attr_eap_type));
                tvp->vp_uint32 = t->default_provisioning_method;
                fr_pair_append(&fake->control_pairs, tvp);
 
                /*
                 * RFC 5422 section 3.2.3 - Authenticating Using EAP-FAST-MSCHAPv2
                 */
                if (t->mode == EAP_FAST_PROVISIONING_ANON) {
                        MEM(tvp = fr_pair_afrom_da(fake, attr_ms_chap_challenge));
                        fr_pair_value_memdup(tvp, t->keyblock->server_challenge, MD5_DIGEST_LENGTH, false);
                        fr_pair_append(&fake->control_pairs, tvp);
                        RHEXDUMP3(t->keyblock->server_challenge, MD5_DIGEST_LENGTH, "MSCHAPv2 auth_challenge");
 
                        MEM(tvp = fr_pair_afrom_da(fake, attr_ms_chap_peer_challenge));
                        fr_pair_value_memdup(tvp, t->keyblock->client_challenge, MD5_DIGEST_LENGTH, false);
                        fr_pair_append(&fake->control_pairs, tvp);
                        RHEXDUMP3(t->keyblock->client_challenge, MD5_DIGEST_LENGTH, "MSCHAPv2 peer_challenge");
                }
        }
 
        /*
         * Call authentication recursively, which will
         * do PAP, CHAP, MS-CHAP, etc.
         */
        eap_virtual_server(request, eap_session, inst->virtual_server);
 
        /*
         * Decide what to do with the reply.
         */
        switch (fake->reply->code) {
        case 0:                 /* No reply code, must be proxied... */
#ifdef WITH_PROXY
                vp = fr_pair_find_by_da(&fake->control, NULL, attr_proxy_to_realm);
                if (vp) {
                        int                     ret;
                        eap_tunnel_data_t       *tunnel;
 
                        RDEBUG2("Tunneled authentication will be proxied to %pV", &vp->data);
 
                        /*
                         *      Tell the original request that it's going to be proxied.
                         */
                        fr_pair_list_copy_by_da(request->control_ctx, &request->control_pairs,
                                                &fake->control_pairs, attr_proxy_to_realm, 0);
 
                        /*
                         *      Seed the proxy packet with the tunneled request.
                         */
                        fr_assert(!request->proxy);
 
                        /*
                         *      FIXME: Actually proxy stuff
                         */
                        request->proxy = request_alloc_internal(request, &(request_init_args_t){ .parent = request });
 
                        request->proxy->packet = talloc_steal(request->proxy, fake->packet);
                        memset(&request->proxy->packet->src_ipaddr, 0,
                               sizeof(request->proxy->packet->src_ipaddr));
                        memset(&request->proxy->packet->src_ipaddr, 0,
                               sizeof(request->proxy->packet->src_ipaddr));
                        request->proxy->packet->src_port = 0;
                        request->proxy->packet->dst_port = 0;
                        fake->packet = NULL;
                        fr_packet_free(&fake->reply);
                        fake->reply = NULL;
 
                        /*
                         *      Set up the callbacks for the tunnel
                         */
                        tunnel = talloc_zero(request, eap_tunnel_data_t);
                        tunnel->tls_session = tls_session;
 
                        /*
                         *      Associate the callback with the request.
                         */
                        ret = request_data_add(request, request->proxy, REQUEST_DATA_EAP_TUNNEL_CALLBACK,
                                               tunnel, false, false, false);
                        fr_cond_assert(ret == 0);
 
                        /*
                         *      rlm_eap.c has taken care of associating the eap_session
                         *      with the fake request.
                         *
                         *      So we associate the fake request with this request.
                         */
                        ret = request_data_add(request, request->proxy, REQUEST_DATA_EAP_MSCHAP_TUNNEL_CALLBACK,
                                               fake, true, false, false);
                        fr_cond_assert(ret == 0);
 
                        fake = NULL;
 
                        /*
                         *      Didn't authenticate the packet, but we're proxying it.
                         */
                        code = FR_RADIUS_CODE_STATUS_CLIENT;
 
                } else
#endif  /* WITH_PROXY */
                  {
                          REDEBUG("No tunneled reply was found, and the request was not proxied: rejecting the user");
                          code = FR_RADIUS_CODE_ACCESS_REJECT;
                  }
                break;
 
        default:
                /*
                 *      Returns RLM_MODULE_FOO, and we want to return FR_FOO
                 */
                rcode = process_reply(eap_session, tls_session, request, fake->reply, &fake->reply_pairs);
                switch (rcode) {
                case RLM_MODULE_REJECT:
                        code = FR_RADIUS_CODE_ACCESS_REJECT;
                        break;
 
                case RLM_MODULE_HANDLED:
                        code = FR_RADIUS_CODE_ACCESS_CHALLENGE;
                        break;
 
                case RLM_MODULE_OK:
                        code = FR_RADIUS_CODE_ACCESS_ACCEPT;
                        break;
 
                default:
                        code = FR_RADIUS_CODE_ACCESS_REJECT;
                        break;
                }
                break;
        }
 
        talloc_free(fake);
 
        return code;
}
 
static fr_radius_packet_code_t eap_fast_crypto_binding(request_t *request, UNUSED eap_session_t *eap_session,
                                       fr_tls_session_t *tls_session, eap_tlv_crypto_binding_tlv_t *binding)
{
        uint8_t                 cmac[sizeof(binding->compound_mac)];
        eap_fast_tunnel_t       *t = talloc_get_type_abort(tls_session->opaque, eap_fast_tunnel_t);
 
        memcpy(cmac, binding->compound_mac, sizeof(cmac));
        memset(binding->compound_mac, 0, sizeof(binding->compound_mac));
 
        RHEXDUMP3((uint8_t const *) binding, sizeof(*binding), "Crypto-Binding TLV for Compound MAC calculation");
        RHEXDUMP3(cmac, sizeof(cmac), "Received Compound MAC");
 
        fr_hmac_sha1(binding->compound_mac, (uint8_t *)binding, sizeof(*binding), t->cmk, EAP_FAST_CMK_LEN);
        if (memcmp(binding->compound_mac, cmac, sizeof(cmac))) {
                RDEBUG2("Crypto-Binding TLV mismatch");
                RHEXDUMP3((uint8_t const *) binding->compound_mac,
                sizeof(binding->compound_mac), "Calculated Compound MAC");
                return FR_RADIUS_CODE_ACCESS_REJECT;
        }
 
        return FR_RADIUS_CODE_ACCESS_ACCEPT;
}
 
static fr_radius_packet_code_t eap_fast_process_tlvs(request_t *request, module_ctx_t const *mctx, eap_session_t *eap_session,
                                     fr_tls_session_t *tls_session, fr_pair_list_t *fast_vps)
{
        eap_fast_tunnel_t               *t = talloc_get_type_abort(tls_session->opaque, eap_fast_tunnel_t);
        fr_pair_t                       *vp;
        eap_tlv_crypto_binding_tlv_t    my_binding, *binding = NULL;
 
        memset(&my_binding, 0, sizeof(my_binding));
 
        for (vp = fr_pair_list_head(fast_vps);
             vp;
             vp = fr_pair_list_next(fast_vps, vp)) {
                fr_radius_packet_code_t code = FR_RADIUS_CODE_ACCESS_REJECT;
                if (vp->da->parent == fr_dict_root(dict_eap_fast)) {
                        if (vp->da == attr_eap_fast_eap_payload) {
                                code = eap_fast_eap_payload(request, mctx, eap_session, tls_session, vp);
                                if (code == FR_RADIUS_CODE_ACCESS_ACCEPT) t->stage = EAP_FAST_CRYPTOBIND_CHECK;
                        } else if ((vp->da == attr_eap_fast_result) ||
                                   (vp->da == attr_eap_fast_intermediate_result)) {
                                code = FR_RADIUS_CODE_ACCESS_ACCEPT;
                                t->stage = EAP_FAST_PROVISIONING;
                        } else {
                                RDEBUG2("ignoring unknown %pP", vp);
                                continue;
                        }
                } else if (vp->da->parent == attr_eap_fast_crypto_binding) {
                        binding = &my_binding;
 
                        /*
                         *      fr_radius_encode_pair() does not work for structures
                         */
                        switch (vp->da->attr) {
                        case 1: /* FR_EAP_FAST_CRYPTO_BINDING_RESERVED */
                                binding->reserved = vp->vp_uint8;
                                break;
                        case 2: /* FR_EAP_FAST_CRYPTO_BINDING_VERSION */
                                binding->version = vp->vp_uint8;
                                break;
                        case 3: /* FR_EAP_FAST_CRYPTO_BINDING_RECV_VERSION */
                                binding->received_version = vp->vp_uint8;
                                break;
                        case 4: /* FR_EAP_FAST_CRYPTO_BINDING_SUB_TYPE */
                                binding->subtype = vp->vp_uint8;
                                break;
                        case 5: /* FR_EAP_FAST_CRYPTO_BINDING_NONCE */
                                if (vp->vp_length >= sizeof(binding->nonce)) {
                                        memcpy(binding->nonce, vp->vp_octets, vp->vp_length);
                                }
                                break;
                        case 6: /* FR_EAP_FAST_CRYPTO_BINDING_COMPOUND_MAC */
                                if (vp->vp_length >= sizeof(binding->compound_mac)) {
                                        memcpy(binding->compound_mac, vp->vp_octets, sizeof(binding->compound_mac));
                                }
                                break;
                        }
                        continue;
                } else if (vp->da->parent == attr_eap_fast_pac_tlv) {
                        if (vp->da == attr_eap_fast_pac_acknowledge) {
                                if (vp->vp_uint32 == EAP_FAST_TLV_RESULT_SUCCESS) {
                                        code = FR_RADIUS_CODE_ACCESS_ACCEPT;
                                        t->pac.expires = fr_time_max();
                                        t->pac.expired = false;
                                        t->stage = EAP_FAST_COMPLETE;
                                }
                        } else if (vp->da == attr_eap_fast_pac_info_pac_type) {
                                if (vp->vp_uint32 != PAC_TYPE_TUNNEL) {
                                        RDEBUG2("only able to serve Tunnel PAC's, ignoring request");
                                        continue;
                                }
                                t->pac.send = true;
                                continue;
                        } else {
                                RDEBUG2("ignoring unknown EAP-FAST-PAC-TLV %pP", vp);
                                continue;
                        }
                } else {
                        RDEBUG2("ignoring non-EAP-FAST TLV %pP", vp);
                        continue;
                }
 
                if (code == FR_RADIUS_CODE_ACCESS_REJECT) return FR_RADIUS_CODE_ACCESS_REJECT;
        }
 
        if (binding) {
                fr_radius_packet_code_t code = eap_fast_crypto_binding(request, eap_session, tls_session, binding);
                if (code == FR_RADIUS_CODE_ACCESS_ACCEPT) {
                        t->stage = EAP_FAST_PROVISIONING;
                }
                return code;
        }
 
        return FR_RADIUS_CODE_ACCESS_ACCEPT;
}
 
 
/*
 * Process the inner tunnel data
 */
static fr_radius_packet_code_t eap_fast_process(request_t *request, module_ctx_t const *mctx, eap_session_t *eap_session, fr_tls_session_t *tls_session)
{
        fr_radius_packet_code_t                 code;
        fr_pair_list_t          fast_vps;
        uint8_t const           *data;
        size_t                  data_len;
        eap_fast_tunnel_t       *t;
 
        fr_pair_list_init(&fast_vps);
        /*
         * Just look at the buffer directly, without doing
         * record_to_buff.
         */
        data_len = tls_session->clean_out.used;
        tls_session->clean_out.used = 0;
        data = tls_session->clean_out.data;
 
        t = talloc_get_type_abort(tls_session->opaque, eap_fast_tunnel_t);
 
        /*
         * See if the tunneled data is well formed.
         */
        if (!eap_fast_verify(request, tls_session, data, data_len)) return FR_RADIUS_CODE_ACCESS_REJECT;
 
        if (t->stage == EAP_FAST_TLS_SESSION_HANDSHAKE) {
                char buf[256];
 
                fr_assert(t->mode == EAP_FAST_UNKNOWN);
 
                if (strstr(SSL_CIPHER_description(SSL_get_current_cipher(tls_session->ssl),
                                                  buf, sizeof(buf)), "Au=None")) {
                        /* FIXME enforce MSCHAPv2 - RFC 5422 section 3.2.2 */
                        RDEBUG2("Using anonymous provisioning");
                        t->mode = EAP_FAST_PROVISIONING_ANON;
                        t->pac.send = true;
                } else {
                        fr_time_t renew;
 
                        if (SSL_session_reused(tls_session->ssl)) {
                                RDEBUG2("Session Resumed from PAC");
                                t->mode = EAP_FAST_NORMAL_AUTH;
                        } else {
                                RDEBUG2("Using authenticated provisioning");
                                t->mode = EAP_FAST_PROVISIONING_AUTH;
                        }
 
                        /*
                         *      Send a new pac at 60% of the lifetime,
                         *      or if the PAC has expired, or if no lifetime was set.
                         */
                        renew = fr_time_add(request->packet->timestamp,
                                            fr_time_delta_wrap((fr_time_delta_unwrap(t->pac_lifetime) * 3) / 5));
 
                        if (t->pac.expired || fr_time_eq(t->pac.expires, fr_time_wrap(0)) ||
                             fr_time_lteq(t->pac.expires, renew)) {
                                t->pac.send = true;
                        }
                }
 
                eap_fast_init_keys(request, tls_session);
 
                eap_fast_send_identity_request(request, tls_session, eap_session);
 
                t->stage = EAP_FAST_AUTHENTICATION;
                return FR_RADIUS_CODE_ACCESS_CHALLENGE;
        }
 
        if (eap_fast_decode_pair(request, &fast_vps, fr_dict_root(dict_eap_fast),
                                 data, data_len, NULL) < 0) return FR_RADIUS_CODE_ACCESS_REJECT;
 
        RDEBUG2("Got Tunneled FAST TLVs");
        log_request_pair_list(L_DBG_LVL_1, request, NULL, &fast_vps, NULL);
        code = eap_fast_process_tlvs(request, mctx, eap_session, tls_session, &fast_vps);
        fr_pair_list_free(&fast_vps);
 
        if (code == FR_RADIUS_CODE_ACCESS_REJECT) return FR_RADIUS_CODE_ACCESS_REJECT;
 
        switch (t->stage) {
        case EAP_FAST_AUTHENTICATION:
                code = FR_RADIUS_CODE_ACCESS_CHALLENGE;
                break;
 
        case EAP_FAST_CRYPTOBIND_CHECK:
        {
                if (t->mode != EAP_FAST_PROVISIONING_ANON && !t->pac.send)
                        t->result_final = true;
 
                eap_fast_append_result(tls_session, code);
 
                eap_fast_update_icmk(request, tls_session, (uint8_t *)&t->isk);
                eap_fast_append_crypto_binding(request, tls_session);
 
                code = FR_RADIUS_CODE_ACCESS_CHALLENGE;
                break;
        }
        case EAP_FAST_PROVISIONING:
                t->result_final = true;
 
                eap_fast_append_result(tls_session, code);
 
                if (t->pac.send) {
                        RDEBUG2("Peer requires new PAC");
                        eap_fast_send_pac_tunnel(request, tls_session);
                        code = FR_RADIUS_CODE_ACCESS_CHALLENGE;
                        break;
                }
 
                t->stage = EAP_FAST_COMPLETE;
                FALL_THROUGH;
 
        case EAP_FAST_COMPLETE:
                /*
                 * RFC 5422 section 3.5 - Network Access after EAP-FAST Provisioning
                 */
                if (t->pac.type && t->pac.expired) {
                        REDEBUG("Rejecting expired PAC.");
                        code = FR_RADIUS_CODE_ACCESS_REJECT;
                        break;
                }
 
                if (t->mode == EAP_FAST_PROVISIONING_ANON) {
                        REDEBUG("Rejecting unauthenticated provisioning");
                        code = FR_RADIUS_CODE_ACCESS_REJECT;
                        break;
                }
 
                /*
                 * eap_crypto_mppe_keys() is unsuitable for EAP-FAST as Cisco decided
                 * it would be a great idea to flip the recv/send keys around
                 */
                #define EAPTLS_MPPE_KEY_LEN 32
                eap_add_reply(request, attr_ms_mppe_recv_key, t->msk, EAPTLS_MPPE_KEY_LEN);
                eap_add_reply(request, attr_ms_mppe_send_key, &t->msk[EAPTLS_MPPE_KEY_LEN], EAPTLS_MPPE_KEY_LEN);
                eap_add_reply(request, attr_eap_msk, t->msk, EAP_FAST_KEY_LEN);
                eap_add_reply(request, attr_eap_emsk, t->emsk, EAP_EMSK_LEN);
 
                break;
 
        default:
                RERROR("Internal sanity check failed in EAP-FAST at %d", t->stage);
                code = FR_RADIUS_CODE_ACCESS_REJECT;
        }
 
        return code;
}
 
/** Allocate the FAST per-session data
 *
 */
static eap_fast_tunnel_t *eap_fast_alloc(TALLOC_CTX *ctx, rlm_eap_fast_t const *inst)
{
        eap_fast_tunnel_t *t = talloc_zero(ctx, eap_fast_tunnel_t);
 
        t->mode = EAP_FAST_UNKNOWN;
        t->stage = EAP_FAST_TLS_SESSION_HANDSHAKE;
 
        t->default_provisioning_method = inst->default_provisioning_method;
 
        t->pac_lifetime = inst->pac_lifetime;
        t->authority_identity = inst->authority_identity;
        t->a_id = inst->a_id;
        t->pac_opaque_key = (uint8_t const *)inst->pac_opaque_key;
 
        return t;
}
 
static void eap_fast_session_ticket(fr_tls_session_t *tls_session, const SSL *s,
                                    uint8_t *secret, int *secret_len)
{
        eap_fast_tunnel_t       *t = talloc_get_type_abort(tls_session->opaque, eap_fast_tunnel_t);
        uint8_t                 seed[2 * SSL3_RANDOM_SIZE];
 
        fr_assert(t->pac.key);
 
        SSL_get_server_random(s, seed, SSL3_RANDOM_SIZE);
        SSL_get_client_random(s, &seed[SSL3_RANDOM_SIZE], SSL3_RANDOM_SIZE);
 
        T_PRF(t->pac.key, PAC_KEY_LENGTH, "PAC to master secret label hash",
              seed, sizeof(seed), secret, SSL_MAX_MASTER_KEY_LENGTH);
        *secret_len = SSL_MAX_MASTER_KEY_LENGTH;
}
 
static int _session_secret(SSL *s, void *secret, int *secret_len,
                           UNUSED STACK_OF(SSL_CIPHER) *peer_ciphers,
                           UNUSED SSL_CIPHER const **cipher, void *arg)
{
        // FIXME enforce non-anon cipher
 
        request_t               *request = fr_tls_session_request(s);
        fr_tls_session_t        *tls_session = arg;
        eap_fast_tunnel_t       *t;
 
        if (!tls_session) return 0;
 
        t = talloc_get_type_abort(tls_session->opaque, eap_fast_tunnel_t);
 
        if (!t->pac.key) return 0;
 
        RDEBUG2("processing PAC-Opaque");
 
        eap_fast_session_ticket(tls_session, s, secret, secret_len);
 
        memset(t->pac.key, 0, PAC_KEY_LENGTH);
        talloc_free(t->pac.key);
        t->pac.key = NULL;
 
        return 1;
}
 
/*
 * hints from hostap:src/crypto/tls_openssl.c:fr_tls_session_ticket_ext_cb()
 *
 * N.B. we actually always tell OpenSSL we have digested the ticket so that
 *      it does not cause a fail loop and enables us to update the PAC easily
 *
 */
static int _session_ticket(SSL *s, uint8_t const *data, int len, void *arg)
{
        fr_tls_session_t        *tls_session = talloc_get_type_abort(arg, fr_tls_session_t);
        request_t               *request = fr_tls_session_request(s);
        eap_fast_tunnel_t       *t;
        fr_pair_list_t          fast_vps;
        fr_pair_t               *vp;
        char const              *errmsg;
        int                     dlen, plen;
        uint16_t                length;
        eap_fast_attr_pac_opaque_t const        *opaque = (eap_fast_attr_pac_opaque_t const *) data;
        eap_fast_attr_pac_opaque_t              opaque_plaintext;
 
        if (!tls_session) return 0;
 
        fr_pair_list_init(&fast_vps);
        t = talloc_get_type_abort(tls_session->opaque, eap_fast_tunnel_t);
 
        RDEBUG2("PAC provided via ClientHello SessionTicket extension");
        RHEXDUMP3(data, len, "PAC-Opaque");
 
        if ((ntohs(opaque->hdr.type) & EAP_FAST_TLV_TYPE) != attr_eap_fast_pac_opaque_tlv->attr) {
                errmsg = "PAC is not of type Opaque";
error:
                RERROR("%s, sending alert to client", errmsg);
                if (fr_tls_session_alert(request, tls_session, SSL3_AL_FATAL, SSL_AD_BAD_CERTIFICATE)) {
                        RERROR("too many alerts");
                        return 0;
                }
                if (t->pac.key) talloc_free(t->pac.key);
 
                memset(&t->pac, 0, sizeof(t->pac));
                if (!fr_pair_list_empty(&fast_vps)) fr_pair_list_free(&fast_vps);
                return 1;
        }
 
        /*
         * we would like to use the length of the SessionTicket
         * but Cisco hates everyone and sends a zero padding payload
         * so we have to use the length in the PAC-Opaque header
         */
        length = ntohs(opaque->hdr.length);
        if (len - sizeof(opaque->hdr) < length) {
                errmsg = "PAC has bad length in header";
                goto error;
        }
 
        if (length < PAC_A_ID_LENGTH + EVP_MAX_IV_LENGTH + EVP_GCM_TLS_TAG_LEN + 1) {
                errmsg = "PAC file too short";
                goto error;
        }
 
        if (memcmp(opaque->aad, t->a_id, PAC_A_ID_LENGTH)) {
                errmsg = "PAC has incorrect A_ID";
                goto error;
        }
 
        dlen = length - sizeof(opaque->aad) - sizeof(opaque->iv) - sizeof(opaque->tag);
        plen = eap_fast_decrypt(opaque->data, dlen, opaque->aad, PAC_A_ID_LENGTH,
                                (uint8_t const *) opaque->tag, t->pac_opaque_key, opaque->iv,
                                (uint8_t *)&opaque_plaintext);
        if (plen == -1) {
                errmsg = "PAC failed to decrypt";
                goto error;
        }
 
        RHEXDUMP3((uint8_t const *)&opaque_plaintext, plen, "PAC-Opaque plaintext data section");
 
        if (eap_fast_decode_pair(tls_session, &fast_vps, attr_eap_fast_pac_opaque_tlv, (uint8_t *)&opaque_plaintext, plen, NULL) < 0) {
                errmsg = fr_strerror();
                goto error;
        }
 
        for (vp = fr_pair_list_head(&fast_vps);
             vp;
             vp = fr_pair_list_next(&fast_vps, vp)) {
                if (vp->da == attr_eap_fast_pac_info_pac_type) {
                        fr_assert(t->pac.type == 0);
                        t->pac.type = vp->vp_uint16;
                } else if (vp->da == attr_eap_fast_pac_info_pac_lifetime) {
                        fr_assert(fr_time_eq(t->pac.expires, fr_time_wrap(0)));
                        t->pac.expires = fr_time_add(request->packet->timestamp, vp->vp_time_delta);
                        t->pac.expired = false;
                /*
                 *      Not sure if this is the correct attr
                 *      The original enum didn't match a specific TLV nesting level
                 */
                } else if (vp->da == attr_eap_fast_pac_key) {
                        fr_assert(t->pac.key == NULL);
                        fr_assert(vp->vp_length == PAC_KEY_LENGTH);
                        t->pac.key = talloc_array(t, uint8_t, PAC_KEY_LENGTH);
                        fr_assert(t->pac.key != NULL);
                        memcpy(t->pac.key, vp->vp_octets, PAC_KEY_LENGTH);
                } else {
                        RERROR("unknown TLV: %pP", vp);
                        errmsg = "unknown TLV";
                        goto error;
                }
        }
 
        fr_pair_list_free(&fast_vps);
 
        if (!t->pac.type) {
                errmsg = "PAC missing type TLV";
                goto error;
        }
 
        if (t->pac.type != PAC_TYPE_TUNNEL) {
                errmsg = "PAC is of not of tunnel type";
                goto error;
        }
 
        if (fr_time_eq(t->pac.expires, fr_time_wrap(0))) {
                errmsg = "PAC missing lifetime TLV";
                goto error;
        }
 
        if (!t->pac.key) {
                errmsg = "PAC missing key TLV";
                goto error;
        }
 
        if (!SSL_set_session_secret_cb(tls_session->ssl, _session_secret, tls_session)) {
                RERROR("Failed setting SSL session secret callback");
                return 0;
        }
 
        return 1;
}
 
static unlang_action_t mod_handshake_resume(unlang_result_t *p_result, module_ctx_t const *mctx, request_t *request)
{
        eap_session_t           *eap_session = talloc_get_type_abort(mctx->rctx, eap_session_t);
        eap_tls_session_t       *eap_tls_session = talloc_get_type_abort(eap_session->opaque, eap_tls_session_t);
        fr_tls_session_t        *tls_session = eap_tls_session->tls_session;
 
        if ((eap_tls_session->state == EAP_TLS_INVALID) || (eap_tls_session->state == EAP_TLS_FAIL)) {
                REDEBUG("[eap-tls process] = %s", fr_table_str_by_value(eap_tls_status_table, eap_tls_session->state, "<INVALID>"));
        } else {
                RDEBUG2("[eap-tls process] = %s", fr_table_str_by_value(eap_tls_status_table, eap_tls_session->state, "<INVALID>"));
        }
 
        switch (eap_tls_session->state) {
        /*
         *      EAP-TLS handshake was successful, tell the
         *      client to keep talking.
         *
         *      If this was EAP-TLS, we would just return
         *      an EAP-TLS-Success packet here.
         */
        case EAP_TLS_ESTABLISHED:
                fr_tls_session_send(request, tls_session);
                fr_assert(tls_session->opaque != NULL);
                break;
 
        /*
         *      The TLS code is still working on the TLS
         *      exchange, and it's a valid TLS request.
         *      do nothing.
         */
        case EAP_TLS_HANDLED:
                RETURN_UNLANG_HANDLED;
 
        /*
         *      Handshake is done, proceed with decoding tunneled
         *      data.
         */
        case EAP_TLS_RECORD_RECV_COMPLETE:
                break;
 
        /*
         *      Anything else: fail.
         */
        default:
                RETURN_UNLANG_FAIL;
        }
 
        /*
         *      Session is established, proceed with decoding
         *      tunneled data.
         */
        RDEBUG2("Session established.  Proceeding to decode tunneled attributes");
 
        /*
         *      Process the FAST portion of the request.
         */
        switch (eap_fast_process(request, mctx, eap_session, tls_session)) {
        case FR_RADIUS_CODE_ACCESS_REJECT:
                eap_tls_fail(request, eap_session);
                RETURN_UNLANG_FAIL;
 
                /*
                 *      Access-Challenge, continue tunneled conversation.
                 */
        case FR_RADIUS_CODE_ACCESS_CHALLENGE:
                fr_tls_session_send(request, tls_session);
                eap_tls_request(request, eap_session);
                RETURN_UNLANG_HANDLED;
 
        /*
         *      Success.
         */
        case FR_RADIUS_CODE_ACCESS_ACCEPT:
                if (eap_tls_success(request, eap_session, NULL) < 0) RETURN_UNLANG_FAIL;
 
                /*
                 *      @todo - generate MPPE keys, which have their own magical deriviation.
                 */
 
                /*
                 *      Result is always OK, even if we fail to persist the
                 *      session data.
                 */
                p_result->rcode = RLM_MODULE_OK;
 
                /*
                 *      Write the session to the session cache
                 *
                 *      We do this here (instead of relying on OpenSSL to call the
                 *      session caching callback), because we only want to write
                 *      session data to the cache if all phases were successful.
                 *
                 *      If we wrote out the cache data earlier, and the server
                 *      exited whilst the session was in progress, the supplicant
                 *      could resume the session (and get access) even if phase2
                 *      never completed.
                 */
                return fr_tls_cache_pending_push(request, tls_session);
 
        /*
         *      No response packet, MUST be proxying it.
         *      The main EAP module will take care of discovering
         *      that the request now has a "proxy" packet, and
         *      will proxy it, rather than returning an EAP packet.
         */
        case FR_RADIUS_CODE_STATUS_CLIENT:
                RETURN_UNLANG_OK;
 
        default:
                break;
        }
 
        /*
         *      Something we don't understand: Reject it.
         */
        eap_tls_fail(request, eap_session);
        RETURN_UNLANG_FAIL;
}
 
/*
 *      Do authentication, by letting EAP-TLS do most of the work.
 */
static unlang_action_t mod_handshake_process(UNUSED unlang_result_t *p_result, UNUSED module_ctx_t const *mctx,
                                             request_t *request)
{
        eap_session_t           *eap_session = eap_session_get(request->parent);
 
        /*
         *      Setup the resumption frame to process the result
         */
        (void)unlang_module_yield(request, mod_handshake_resume, NULL, 0, eap_session);
 
        /*
         *      Process TLS layer until done.
         */
        return eap_tls_process(request, eap_session);
}
 
/*
 *      Send an initial eap-tls request to the peer, using the libeap functions.
 */
static unlang_action_t mod_session_init(unlang_result_t *p_result, module_ctx_t const *mctx, request_t *request)
{
        rlm_eap_fast_t const    *inst = talloc_get_type_abort_const(mctx->mi->data, rlm_eap_fast_t);
        rlm_eap_fast_thread_t   *thread = talloc_get_type_abort(mctx->thread, rlm_eap_fast_thread_t);
        eap_session_t           *eap_session = eap_session_get(request->parent);
        eap_tls_session_t       *eap_tls_session;
        fr_tls_session_t        *tls_session;
 
        fr_pair_t               *vp;
        bool                    client_cert;
 
        eap_session->tls = true;
 
        /*
         *      EAP-TLS-Require-Client-Cert attribute will override
         *      the require_client_cert configuration option.
         */
        vp = fr_pair_find_by_da(&request->control_pairs, NULL, attr_eap_tls_require_client_cert);
        if (vp) {
                client_cert = vp->vp_uint32 ? true : false;
        } else {
                client_cert = inst->req_client_cert;
        }
 
        eap_session->opaque = eap_tls_session = eap_tls_session_init(request, eap_session, thread->ssl_ctx, client_cert);
        if (!eap_tls_session) RETURN_UNLANG_FAIL;
 
        tls_session = eap_tls_session->tls_session;
 
        if (inst->cipher_list) {
                RDEBUG2("Over-riding main cipher list with '%s'", inst->cipher_list);
 
                if (!SSL_set_cipher_list(tls_session->ssl, inst->cipher_list)) {
                        REDEBUG("Failed over-riding cipher list to '%s'.  EAP-FAST will likely not work",
                                inst->cipher_list);
                }
        }
 
#ifdef SSL_OP_NO_TLSv1_2
        /*
         *      Forcibly disable TLSv1.2
         */
        SSL_set_options(tls_session->ssl, SSL_OP_NO_TLSv1_2);
#endif
 
        /*
         *      Push TLV of authority_identity into tls_record
         *      call eap_tls_compose() with args
         *
         *      RFC 4851 section 4.1.1
         *      N.B. mandatory/reserved flags are not applicable here
         */
        eap_fast_tlv_append(tls_session, attr_eap_fast_pac_info_a_id, false, PAC_A_ID_LENGTH, inst->a_id);
 
        /*
         *      TLS session initialization is over.  Now handle TLS
         *      related handshaking or application data.
         */
        if (eap_tls_compose(request, eap_session, EAP_TLS_START_SEND,
                            SET_START(eap_tls_session->base_flags) | EAP_FAST_VERSION,
                            &tls_session->clean_in, tls_session->clean_in.used,
                            tls_session->clean_in.used) < 0) {
                talloc_free(tls_session);
                RETURN_UNLANG_FAIL;
        }
 
        tls_session->record_init(&tls_session->clean_in);
        tls_session->opaque = eap_fast_alloc(tls_session, inst);
        eap_session->process = mod_handshake_process;
 
        if (!SSL_set_session_ticket_ext_cb(tls_session->ssl, _session_ticket, tls_session)) {
                RERROR("Failed setting SSL session ticket callback");
                RETURN_UNLANG_FAIL;
        }
 
        RETURN_UNLANG_HANDLED;
}
 
static int mod_thread_instantiate(module_thread_inst_ctx_t const *mctx)
{
        rlm_eap_fast_t          *inst = talloc_get_type_abort(mctx->mi->data, rlm_eap_fast_t);
        rlm_eap_fast_thread_t   *t = talloc_get_type_abort(mctx->thread, rlm_eap_fast_thread_t);
 
        t->ssl_ctx = fr_tls_ctx_alloc(inst->tls_conf, false);
        if (!t->ssl_ctx) return -1;
 
        return 0;
}
 
static int mod_thread_detach(module_thread_inst_ctx_t const *mctx)
{
        rlm_eap_fast_thread_t   *t = talloc_get_type_abort(mctx->thread, rlm_eap_fast_thread_t);
 
        if (likely(t->ssl_ctx != NULL)) SSL_CTX_free(t->ssl_ctx);
        t->ssl_ctx = NULL;
 
        return 0;
}
 
/*
 *      Attach the module.
 */
static int mod_instantiate(module_inst_ctx_t const *mctx)
{
        rlm_eap_fast_t          *inst = talloc_get_type_abort(mctx->mi->data, rlm_eap_fast_t);
        CONF_SECTION            *conf = mctx->mi->conf;
 
        inst->default_provisioning_method = eap_name2type(inst->default_provisioning_method_name);
        if (!inst->default_provisioning_method) {
                cf_log_err_by_child(conf, "default_provisioning_eap_type", "Unknown EAP type %s",
                                   inst->default_provisioning_method_name);
                return -1;
        }
 
        /*
         *      Read tls configuration, either from group given by 'tls'
         *      option, or from the eap-tls configuration.
         */
        inst->tls_conf = eap_tls_conf_parse(conf);
 
        if (!inst->tls_conf) {
                cf_log_err_by_child(conf, "tls", "Failed initializing SSL context");
                return -1;
        }
 
        if (talloc_strlen(inst->pac_opaque_key) != 32) {
                cf_log_err_by_child(conf, "pac_opaque_key", "Must be 32 bytes long");
                return -1;
        }
 
        /*
         *      Allow anything for the TLS version, we try to forcibly
         *      disable TLSv1.2 later.
         */
        if (inst->tls_conf->tls_min_version > (float) 1.1) {
                cf_log_err_by_child(conf, "tls_min_version", "require tls_min_version <= 1.1");
                return -1;
        }
 
        if (!fr_time_delta_ispos(inst->pac_lifetime)) {
                cf_log_err_by_child(conf, "pac_lifetime", "must be non-zero");
                return -1;
        }
 
        fr_assert(PAC_A_ID_LENGTH == MD5_DIGEST_LENGTH);
 
        fr_md5_calc(inst->a_id, (uint8_t const *)inst->authority_identity,
                    talloc_strlen(inst->authority_identity));
 
        return 0;
}
 
/*
 *      The module name should be the only globally exported symbol.
 *      That is, everything else should be 'static'.
 */
extern rlm_eap_submodule_t rlm_eap_fast;
rlm_eap_submodule_t rlm_eap_fast = {
        .common = {
                .magic                  = MODULE_MAGIC_INIT,
                .name                   = "eap_fast",
 
                .inst_size              = sizeof(rlm_eap_fast_t),
                .config                 = submodule_config,
                .instantiate            = mod_instantiate,      /* Create new submodule instance */
 
                .thread_inst_size       = sizeof(rlm_eap_fast_thread_t),
                .thread_instantiate     = mod_thread_instantiate,
                .thread_detach          = mod_thread_detach,
        },
        .provides               = { FR_EAP_METHOD_FAST },
        .session_init           = mod_session_init,     /* Initialise a new EAP session */
};