

#if defined(__TANDEM) && defined(_SPT_MODEL_)
# include <spthread.h>
# include <spt_extensions.h> 
#endif

#include <string.h>
#include "internal/nelem.h"
#include "internal/cryptlib.h"
#include "../ssl_local.h"
#include "statem_local.h"

static int final_renegotiate(SSL_CONNECTION *s, unsigned int context, int sent);
static int init_server_name(SSL_CONNECTION *s, unsigned int context);
static int final_server_name(SSL_CONNECTION *s, unsigned int context, int sent);
static int final_ec_pt_formats(SSL_CONNECTION *s, unsigned int context,
                               int sent);
static int init_session_ticket(SSL_CONNECTION *s, unsigned int context);
#ifndef OPENSSL_NO_OCSP
static int init_status_request(SSL_CONNECTION *s, unsigned int context);
#endif
#ifndef OPENSSL_NO_NEXTPROTONEG
static int init_npn(SSL_CONNECTION *s, unsigned int context);
#endif
static int init_alpn(SSL_CONNECTION *s, unsigned int context);
static int final_alpn(SSL_CONNECTION *s, unsigned int context, int sent);
static int init_sig_algs_cert(SSL_CONNECTION *s, unsigned int context);
static int init_sig_algs(SSL_CONNECTION *s, unsigned int context);
static int init_server_cert_type(SSL_CONNECTION *sc, unsigned int context);
static int init_client_cert_type(SSL_CONNECTION *sc, unsigned int context);
static int init_certificate_authorities(SSL_CONNECTION *s,
                                        unsigned int context);
static EXT_RETURN tls_construct_certificate_authorities(SSL_CONNECTION *s,
                                                        WPACKET *pkt,
                                                        unsigned int context,
                                                        X509 *x,
                                                        size_t chainidx);
static int tls_parse_certificate_authorities(SSL_CONNECTION *s, PACKET *pkt,
                                             unsigned int context, X509 *x,
                                             size_t chainidx);
#ifndef OPENSSL_NO_SRP
static int init_srp(SSL_CONNECTION *s, unsigned int context);
#endif
static int init_ec_point_formats(SSL_CONNECTION *s, unsigned int context);
static int init_etm(SSL_CONNECTION *s, unsigned int context);
static int init_ems(SSL_CONNECTION *s, unsigned int context);
static int final_ems(SSL_CONNECTION *s, unsigned int context, int sent);
static int init_psk_kex_modes(SSL_CONNECTION *s, unsigned int context);
static int final_key_share(SSL_CONNECTION *s, unsigned int context, int sent);
#ifndef OPENSSL_NO_SRTP
static int init_srtp(SSL_CONNECTION *s, unsigned int context);
#endif
static int final_sig_algs(SSL_CONNECTION *s, unsigned int context, int sent);
static int final_early_data(SSL_CONNECTION *s, unsigned int context, int sent);
static int final_maxfragmentlen(SSL_CONNECTION *s, unsigned int context,
                                int sent);
static int init_post_handshake_auth(SSL_CONNECTION *s, unsigned int context);
static int final_psk(SSL_CONNECTION *s, unsigned int context, int sent);
static int tls_init_compress_certificate(SSL_CONNECTION *sc, unsigned int context);
static EXT_RETURN tls_construct_compress_certificate(SSL_CONNECTION *sc, WPACKET *pkt,
                                                     unsigned int context,
                                                     X509 *x, size_t chainidx);
static int tls_parse_compress_certificate(SSL_CONNECTION *sc, PACKET *pkt,
                                          unsigned int context,
                                          X509 *x, size_t chainidx);


typedef struct extensions_definition_st {
    
    unsigned int type;
    
    unsigned int context;
    
    int (*init)(SSL_CONNECTION *s, unsigned int context);
    
    int (*parse_ctos)(SSL_CONNECTION *s, PACKET *pkt, unsigned int context,
                      X509 *x, size_t chainidx);
    
    int (*parse_stoc)(SSL_CONNECTION *s, PACKET *pkt, unsigned int context,
                      X509 *x, size_t chainidx);
    
    EXT_RETURN (*construct_stoc)(SSL_CONNECTION *s, WPACKET *pkt,
                                 unsigned int context,
                                 X509 *x, size_t chainidx);
    
    EXT_RETURN (*construct_ctos)(SSL_CONNECTION *s, WPACKET *pkt,
                                 unsigned int context,
                                 X509 *x, size_t chainidx);
    
    int (*final)(SSL_CONNECTION *s, unsigned int context, int sent);
} EXTENSION_DEFINITION;


#define INVALID_EXTENSION { TLSEXT_TYPE_invalid, 0, NULL, NULL, NULL, NULL, NULL, NULL }
static const EXTENSION_DEFINITION ext_defs[] = {
    {
        TLSEXT_TYPE_renegotiate,
        SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
        | SSL_EXT_SSL3_ALLOWED | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
        NULL, tls_parse_ctos_renegotiate, tls_parse_stoc_renegotiate,
        tls_construct_stoc_renegotiate, tls_construct_ctos_renegotiate,
        final_renegotiate
    },
    {
        TLSEXT_TYPE_server_name,
        SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
        | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS,
        init_server_name,
        tls_parse_ctos_server_name, tls_parse_stoc_server_name,
        tls_construct_stoc_server_name, tls_construct_ctos_server_name,
        final_server_name
    },
    {
        TLSEXT_TYPE_max_fragment_length,
        SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
        | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS,
        NULL, tls_parse_ctos_maxfragmentlen, tls_parse_stoc_maxfragmentlen,
        tls_construct_stoc_maxfragmentlen, tls_construct_ctos_maxfragmentlen,
        final_maxfragmentlen
    },
#ifndef OPENSSL_NO_SRP
    {
        TLSEXT_TYPE_srp,
        SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
        init_srp, tls_parse_ctos_srp, NULL, NULL, tls_construct_ctos_srp, NULL
    },
#else
    INVALID_EXTENSION,
#endif
    {
        TLSEXT_TYPE_ec_point_formats,
        SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
        | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
        init_ec_point_formats, tls_parse_ctos_ec_pt_formats, tls_parse_stoc_ec_pt_formats,
        tls_construct_stoc_ec_pt_formats, tls_construct_ctos_ec_pt_formats,
        final_ec_pt_formats
    },
    {
        
        TLSEXT_TYPE_supported_groups,
        SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS
        | SSL_EXT_TLS1_2_SERVER_HELLO,
        NULL, tls_parse_ctos_supported_groups, NULL,
        tls_construct_stoc_supported_groups,
        tls_construct_ctos_supported_groups, NULL
    },
    {
        TLSEXT_TYPE_session_ticket,
        SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
        | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
        init_session_ticket, tls_parse_ctos_session_ticket,
        tls_parse_stoc_session_ticket, tls_construct_stoc_session_ticket,
        tls_construct_ctos_session_ticket, NULL
    },
#ifndef OPENSSL_NO_OCSP
    {
        TLSEXT_TYPE_status_request,
        SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
        | SSL_EXT_TLS1_3_CERTIFICATE | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST,
        init_status_request, tls_parse_ctos_status_request,
        tls_parse_stoc_status_request, tls_construct_stoc_status_request,
        tls_construct_ctos_status_request, NULL
    },
#else
    INVALID_EXTENSION,
#endif
#ifndef OPENSSL_NO_NEXTPROTONEG
    {
        TLSEXT_TYPE_next_proto_neg,
        SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
        | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
        init_npn, tls_parse_ctos_npn, tls_parse_stoc_npn,
        tls_construct_stoc_next_proto_neg, tls_construct_ctos_npn, NULL
    },
#else
    INVALID_EXTENSION,
#endif
    {
        
        TLSEXT_TYPE_application_layer_protocol_negotiation,
        SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
        | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS,
        init_alpn, tls_parse_ctos_alpn, tls_parse_stoc_alpn,
        tls_construct_stoc_alpn, tls_construct_ctos_alpn, final_alpn
    },
#ifndef OPENSSL_NO_SRTP
    {
        TLSEXT_TYPE_use_srtp,
        SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
        | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS | SSL_EXT_DTLS_ONLY,
        init_srtp, tls_parse_ctos_use_srtp, tls_parse_stoc_use_srtp,
        tls_construct_stoc_use_srtp, tls_construct_ctos_use_srtp, NULL
    },
#else
    INVALID_EXTENSION,
#endif
    {
        TLSEXT_TYPE_encrypt_then_mac,
        SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
        | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
        init_etm, tls_parse_ctos_etm, tls_parse_stoc_etm,
        tls_construct_stoc_etm, tls_construct_ctos_etm, NULL
    },
#ifndef OPENSSL_NO_CT
    {
        TLSEXT_TYPE_signed_certificate_timestamp,
        SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
        | SSL_EXT_TLS1_3_CERTIFICATE | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST,
        NULL,
        
        NULL, tls_parse_stoc_sct, NULL, tls_construct_ctos_sct,  NULL
    },
#else
    INVALID_EXTENSION,
#endif
    {
        TLSEXT_TYPE_extended_master_secret,
        SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
        | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
        init_ems, tls_parse_ctos_ems, tls_parse_stoc_ems,
        tls_construct_stoc_ems, tls_construct_ctos_ems, final_ems
    },
    {
        TLSEXT_TYPE_signature_algorithms_cert,
        SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST,
        init_sig_algs_cert, tls_parse_ctos_sig_algs_cert,
        tls_parse_ctos_sig_algs_cert,
        
        NULL, NULL, NULL
    },
    {
        TLSEXT_TYPE_post_handshake_auth,
        SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ONLY,
        init_post_handshake_auth,
        tls_parse_ctos_post_handshake_auth, NULL,
        NULL, tls_construct_ctos_post_handshake_auth,
        NULL,
    },
    {
        TLSEXT_TYPE_client_cert_type,
        SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS
        | SSL_EXT_TLS1_2_SERVER_HELLO,
        init_client_cert_type,
        tls_parse_ctos_client_cert_type, tls_parse_stoc_client_cert_type,
        tls_construct_stoc_client_cert_type, tls_construct_ctos_client_cert_type,
        NULL
    },
    {
        TLSEXT_TYPE_server_cert_type,
        SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS
        | SSL_EXT_TLS1_2_SERVER_HELLO,
        init_server_cert_type,
        tls_parse_ctos_server_cert_type, tls_parse_stoc_server_cert_type,
        tls_construct_stoc_server_cert_type, tls_construct_ctos_server_cert_type,
        NULL
    },
    {
        TLSEXT_TYPE_signature_algorithms,
        SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST,
        init_sig_algs, tls_parse_ctos_sig_algs,
        tls_parse_ctos_sig_algs, tls_construct_ctos_sig_algs,
        tls_construct_ctos_sig_algs, final_sig_algs
    },
    {
        TLSEXT_TYPE_supported_versions,
        SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_SERVER_HELLO
        | SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST | SSL_EXT_TLS_IMPLEMENTATION_ONLY,
        NULL,
        
        NULL, tls_parse_stoc_supported_versions,
        tls_construct_stoc_supported_versions,
        tls_construct_ctos_supported_versions, NULL
    },
    {
        TLSEXT_TYPE_psk_kex_modes,
        SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS_IMPLEMENTATION_ONLY
        | SSL_EXT_TLS1_3_ONLY,
        init_psk_kex_modes, tls_parse_ctos_psk_kex_modes, NULL, NULL,
        tls_construct_ctos_psk_kex_modes, NULL
    },
    {
        
        TLSEXT_TYPE_key_share,
        SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_SERVER_HELLO
        | SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST | SSL_EXT_TLS_IMPLEMENTATION_ONLY
        | SSL_EXT_TLS1_3_ONLY,
        NULL, tls_parse_ctos_key_share, tls_parse_stoc_key_share,
        tls_construct_stoc_key_share, tls_construct_ctos_key_share,
        final_key_share
    },
    {
        
        TLSEXT_TYPE_cookie,
        SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST
        | SSL_EXT_TLS_IMPLEMENTATION_ONLY | SSL_EXT_TLS1_3_ONLY,
        NULL, tls_parse_ctos_cookie, tls_parse_stoc_cookie,
        tls_construct_stoc_cookie, tls_construct_ctos_cookie, NULL
    },
    {
        
        TLSEXT_TYPE_cryptopro_bug,
        SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO
        | SSL_EXT_TLS1_2_AND_BELOW_ONLY,
        NULL, NULL, NULL, tls_construct_stoc_cryptopro_bug, NULL, NULL
    },
    {
        TLSEXT_TYPE_compress_certificate,
        SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST
        | SSL_EXT_TLS_IMPLEMENTATION_ONLY | SSL_EXT_TLS1_3_ONLY,
        tls_init_compress_certificate,
        tls_parse_compress_certificate, tls_parse_compress_certificate,
        tls_construct_compress_certificate, tls_construct_compress_certificate,
        NULL
    },
    {
        TLSEXT_TYPE_early_data,
        SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS
        | SSL_EXT_TLS1_3_NEW_SESSION_TICKET | SSL_EXT_TLS1_3_ONLY,
        NULL, tls_parse_ctos_early_data, tls_parse_stoc_early_data,
        tls_construct_stoc_early_data, tls_construct_ctos_early_data,
        final_early_data
    },
    {
        TLSEXT_TYPE_certificate_authorities,
        SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST
        | SSL_EXT_TLS1_3_ONLY,
        init_certificate_authorities,
        tls_parse_certificate_authorities, tls_parse_certificate_authorities,
        tls_construct_certificate_authorities,
        tls_construct_certificate_authorities, NULL,
    },
    {
        
        TLSEXT_TYPE_padding,
        SSL_EXT_CLIENT_HELLO,
        NULL,
        
        NULL, NULL, NULL, tls_construct_ctos_padding, NULL
    },
    {
        
        TLSEXT_TYPE_psk,
        SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_3_SERVER_HELLO
        | SSL_EXT_TLS_IMPLEMENTATION_ONLY | SSL_EXT_TLS1_3_ONLY,
        NULL, tls_parse_ctos_psk, tls_parse_stoc_psk, tls_construct_stoc_psk,
        tls_construct_ctos_psk, final_psk
    }
};


unsigned int ossl_get_extension_type(size_t idx)
{
    size_t num_exts = OSSL_NELEM(ext_defs);

    if (idx >= num_exts)
        return TLSEXT_TYPE_out_of_range;

    return ext_defs[idx].type;
}


static int validate_context(SSL_CONNECTION *s, unsigned int extctx,
                            unsigned int thisctx)
{
    
    if ((thisctx & extctx) == 0)
        return 0;

    if (SSL_CONNECTION_IS_DTLS(s)) {
        if ((extctx & SSL_EXT_TLS_ONLY) != 0)
            return 0;
    } else if ((extctx & SSL_EXT_DTLS_ONLY) != 0) {
        return 0;
    }

    return 1;
}

int tls_validate_all_contexts(SSL_CONNECTION *s, unsigned int thisctx,
                              RAW_EXTENSION *exts)
{
    size_t i, num_exts, builtin_num = OSSL_NELEM(ext_defs), offset;
    RAW_EXTENSION *thisext;
    unsigned int context;
    ENDPOINT role = ENDPOINT_BOTH;

    if ((thisctx & SSL_EXT_CLIENT_HELLO) != 0)
        role = ENDPOINT_SERVER;
    else if ((thisctx & SSL_EXT_TLS1_2_SERVER_HELLO) != 0)
        role = ENDPOINT_CLIENT;

    
    num_exts = builtin_num + s->cert->custext.meths_count;

    for (thisext = exts, i = 0; i < num_exts; i++, thisext++) {
        if (!thisext->present)
            continue;

        if (i < builtin_num) {
            context = ext_defs[i].context;
        } else {
            custom_ext_method *meth = NULL;

            meth = custom_ext_find(&s->cert->custext, role, thisext->type,
                                   &offset);
            if (!ossl_assert(meth != NULL))
                return 0;
            context = meth->context;
        }

        if (!validate_context(s, context, thisctx))
            return 0;
    }

    return 1;
}


static int verify_extension(SSL_CONNECTION *s, unsigned int context,
                            unsigned int type, custom_ext_methods *meths,
                            RAW_EXTENSION *rawexlist, RAW_EXTENSION **found)
{
    size_t i;
    size_t builtin_num = OSSL_NELEM(ext_defs);
    const EXTENSION_DEFINITION *thisext;

    for (i = 0, thisext = ext_defs; i < builtin_num; i++, thisext++) {
        if (type == thisext->type) {
            if (!validate_context(s, thisext->context, context))
                return 0;

            *found = &rawexlist[i];
            return 1;
        }
    }

    
    if (meths != NULL) {
        size_t offset = 0;
        ENDPOINT role = ENDPOINT_BOTH;
        custom_ext_method *meth = NULL;

        if ((context & SSL_EXT_CLIENT_HELLO) != 0)
            role = ENDPOINT_SERVER;
        else if ((context & SSL_EXT_TLS1_2_SERVER_HELLO) != 0)
            role = ENDPOINT_CLIENT;

        meth = custom_ext_find(meths, role, type, &offset);
        if (meth != NULL) {
            if (!validate_context(s, meth->context, context))
                return 0;
            *found = &rawexlist[offset + builtin_num];
            return 1;
        }
    }

    
    *found = NULL;
    return 1;
}


int extension_is_relevant(SSL_CONNECTION *s, unsigned int extctx,
                          unsigned int thisctx)
{
    int is_tls13;

    
    if ((thisctx & SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST) != 0)
        is_tls13 = 1;
    else
        is_tls13 = SSL_CONNECTION_IS_TLS13(s);

    if ((SSL_CONNECTION_IS_DTLS(s)
                && (extctx & SSL_EXT_TLS_IMPLEMENTATION_ONLY) != 0)
            || (s->version == SSL3_VERSION
                    && (extctx & SSL_EXT_SSL3_ALLOWED) == 0)
            
            || (is_tls13 && (extctx & SSL_EXT_TLS1_2_AND_BELOW_ONLY) != 0)
            || (!is_tls13 && (extctx & SSL_EXT_TLS1_3_ONLY) != 0
                && (thisctx & SSL_EXT_CLIENT_HELLO) == 0)
            || (s->server && !is_tls13 && (extctx & SSL_EXT_TLS1_3_ONLY) != 0)
            || (s->hit && (extctx & SSL_EXT_IGNORE_ON_RESUMPTION) != 0))
        return 0;
    return 1;
}


int tls_collect_extensions(SSL_CONNECTION *s, PACKET *packet,
                           unsigned int context,
                           RAW_EXTENSION **res, size_t *len, int init)
{
    PACKET extensions = *packet;
    size_t i = 0;
    size_t num_exts;
    custom_ext_methods *exts = &s->cert->custext;
    RAW_EXTENSION *raw_extensions = NULL;
    const EXTENSION_DEFINITION *thisexd;

    *res = NULL;

    
    if ((context & SSL_EXT_CLIENT_HELLO) != 0)
        custom_ext_init(&s->cert->custext);

    num_exts = OSSL_NELEM(ext_defs) + (exts != NULL ? exts->meths_count : 0);
    raw_extensions = OPENSSL_zalloc(num_exts * sizeof(*raw_extensions));
    if (raw_extensions == NULL) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_CRYPTO_LIB);
        return 0;
    }

    i = 0;
    while (PACKET_remaining(&extensions) > 0) {
        unsigned int type, idx;
        PACKET extension;
        RAW_EXTENSION *thisex;

        if (!PACKET_get_net_2(&extensions, &type) ||
            !PACKET_get_length_prefixed_2(&extensions, &extension)) {
            SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_BAD_EXTENSION);
            goto err;
        }
        
        if (!verify_extension(s, context, type, exts, raw_extensions, &thisex)
                || (thisex != NULL && thisex->present == 1)
                || (type == TLSEXT_TYPE_psk
                    && (context & SSL_EXT_CLIENT_HELLO) != 0
                    && PACKET_remaining(&extensions) != 0)) {
            SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BAD_EXTENSION);
            goto err;
        }
        idx = thisex - raw_extensions;
        
        if (idx < OSSL_NELEM(ext_defs)
                && (context & (SSL_EXT_CLIENT_HELLO
                               | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST
                               | SSL_EXT_TLS1_3_NEW_SESSION_TICKET)) == 0
                && type != TLSEXT_TYPE_cookie
                && type != TLSEXT_TYPE_renegotiate
                && type != TLSEXT_TYPE_signed_certificate_timestamp
                && (s->ext.extflags[idx] & SSL_EXT_FLAG_SENT) == 0
#ifndef OPENSSL_NO_GOST
                && !((context & SSL_EXT_TLS1_2_SERVER_HELLO) != 0
                     && type == TLSEXT_TYPE_cryptopro_bug)
#endif
                                                                ) {
            SSLfatal(s, SSL_AD_UNSUPPORTED_EXTENSION,
                     SSL_R_UNSOLICITED_EXTENSION);
            goto err;
        }
        if (thisex != NULL) {
            thisex->data = extension;
            thisex->present = 1;
            thisex->type = type;
            thisex->received_order = i++;
            if (s->ext.debug_cb)
                s->ext.debug_cb(SSL_CONNECTION_GET_SSL(s), !s->server,
                                thisex->type, PACKET_data(&thisex->data),
                                PACKET_remaining(&thisex->data),
                                s->ext.debug_arg);
        }
    }

    if (init) {
        
        for (thisexd = ext_defs, i = 0; i < OSSL_NELEM(ext_defs);
             i++, thisexd++) {
            if (thisexd->init != NULL && (thisexd->context & context) != 0
                && extension_is_relevant(s, thisexd->context, context)
                && !thisexd->init(s, context)) {
                
                goto err;
            }
        }
    }

    *res = raw_extensions;
    if (len != NULL)
        *len = num_exts;
    return 1;

 err:
    OPENSSL_free(raw_extensions);
    return 0;
}


int tls_parse_extension(SSL_CONNECTION *s, TLSEXT_INDEX idx, int context,
                        RAW_EXTENSION *exts, X509 *x, size_t chainidx)
{
    RAW_EXTENSION *currext = &exts[idx];
    int (*parser)(SSL_CONNECTION *s, PACKET *pkt, unsigned int context, X509 *x,
                  size_t chainidx) = NULL;

    
    if (!currext->present)
        return 1;

    
    if (currext->parsed)
        return 1;

    currext->parsed = 1;

    if (idx < OSSL_NELEM(ext_defs)) {
        
        const EXTENSION_DEFINITION *extdef = &ext_defs[idx];

        
        if (!extension_is_relevant(s, extdef->context, context))
            return 1;

        parser = s->server ? extdef->parse_ctos : extdef->parse_stoc;

        if (parser != NULL)
            return parser(s, &currext->data, context, x, chainidx);

        
    }

    
    return custom_ext_parse(s, context, currext->type,
                            PACKET_data(&currext->data),
                            PACKET_remaining(&currext->data),
                            x, chainidx);
}


int tls_parse_all_extensions(SSL_CONNECTION *s, int context,
                             RAW_EXTENSION *exts, X509 *x,
                             size_t chainidx, int fin)
{
    size_t i, numexts = OSSL_NELEM(ext_defs);
    const EXTENSION_DEFINITION *thisexd;

    
    numexts += s->cert->custext.meths_count;

    
    for (i = 0; i < numexts; i++) {
        if (!tls_parse_extension(s, i, context, exts, x, chainidx)) {
            
            return 0;
        }
    }

    if (fin) {
        
        for (i = 0, thisexd = ext_defs; i < OSSL_NELEM(ext_defs);
             i++, thisexd++) {
            if (thisexd->final != NULL && (thisexd->context & context) != 0
                && !thisexd->final(s, context, exts[i].present)) {
                
                return 0;
            }
        }
    }

    return 1;
}

int should_add_extension(SSL_CONNECTION *s, unsigned int extctx,
                         unsigned int thisctx, int max_version)
{
    
    if ((extctx & thisctx) == 0)
        return 0;

    
    if (!extension_is_relevant(s, extctx, thisctx)
            || ((extctx & SSL_EXT_TLS1_3_ONLY) != 0
                && (thisctx & SSL_EXT_CLIENT_HELLO) != 0
                && (SSL_CONNECTION_IS_DTLS(s) || max_version < TLS1_3_VERSION)))
        return 0;

    return 1;
}


int tls_construct_extensions(SSL_CONNECTION *s, WPACKET *pkt,
                             unsigned int context,
                             X509 *x, size_t chainidx)
{
    size_t i;
    int min_version, max_version = 0, reason;
    const EXTENSION_DEFINITION *thisexd;
    int for_comp = (context & SSL_EXT_TLS1_3_CERTIFICATE_COMPRESSION) != 0;

    if (!WPACKET_start_sub_packet_u16(pkt)
               
            || ((context &
                 (SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO)) != 0
                && !WPACKET_set_flags(pkt,
                                      WPACKET_FLAGS_ABANDON_ON_ZERO_LENGTH))) {
        if (!for_comp)
            SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        return 0;
    }

    if ((context & SSL_EXT_CLIENT_HELLO) != 0) {
        reason = ssl_get_min_max_version(s, &min_version, &max_version, NULL);
        if (reason != 0) {
            if (!for_comp)
                SSLfatal(s, SSL_AD_INTERNAL_ERROR, reason);
            return 0;
        }
    }

    
    if ((context & SSL_EXT_CLIENT_HELLO) != 0) {
        
        custom_ext_init(&s->cert->custext);
    }
    if (!custom_ext_add(s, context, pkt, x, chainidx, max_version)) {
        
        return 0;
    }

    for (i = 0, thisexd = ext_defs; i < OSSL_NELEM(ext_defs); i++, thisexd++) {
        EXT_RETURN (*construct)(SSL_CONNECTION *s, WPACKET *pkt,
                                unsigned int context,
                                X509 *x, size_t chainidx);
        EXT_RETURN ret;

        
        if (!should_add_extension(s, thisexd->context, context, max_version))
            continue;

        construct = s->server ? thisexd->construct_stoc
                              : thisexd->construct_ctos;

        if (construct == NULL)
            continue;

        ret = construct(s, pkt, context, x, chainidx);
        if (ret == EXT_RETURN_FAIL) {
            
            return 0;
        }
        if (ret == EXT_RETURN_SENT
                && (context & (SSL_EXT_CLIENT_HELLO
                               | SSL_EXT_TLS1_3_CERTIFICATE_REQUEST
                               | SSL_EXT_TLS1_3_NEW_SESSION_TICKET)) != 0)
            s->ext.extflags[i] |= SSL_EXT_FLAG_SENT;
    }

    if (!WPACKET_close(pkt)) {
        if (!for_comp)
            SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        return 0;
    }

    return 1;
}



static int final_renegotiate(SSL_CONNECTION *s, unsigned int context, int sent)
{
    if (!s->server) {
        
        if (!(s->options & SSL_OP_LEGACY_SERVER_CONNECT)
                && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)
                && !sent) {
            SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
                     SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
            return 0;
        }

        return 1;
    }

    
    if (s->renegotiate
            && !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION)
            && !sent) {
        SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE,
                 SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
        return 0;
    }


    return 1;
}

static ossl_inline void ssl_tsan_decr(const SSL_CTX *ctx,
                                      TSAN_QUALIFIER int *stat)
{
    if (ssl_tsan_lock(ctx)) {
        tsan_decr(stat);
        ssl_tsan_unlock(ctx);
    }
}

static int init_server_name(SSL_CONNECTION *s, unsigned int context)
{
    if (s->server) {
        s->servername_done = 0;

        OPENSSL_free(s->ext.hostname);
        s->ext.hostname = NULL;
    }

    return 1;
}

static int final_server_name(SSL_CONNECTION *s, unsigned int context, int sent)
{
    int ret = SSL_TLSEXT_ERR_NOACK;
    int altmp = SSL_AD_UNRECOGNIZED_NAME;
    SSL *ssl = SSL_CONNECTION_GET_SSL(s);
    SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s);
    int was_ticket = (SSL_get_options(ssl) & SSL_OP_NO_TICKET) == 0;

    if (!ossl_assert(sctx != NULL) || !ossl_assert(s->session_ctx != NULL)) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        return 0;
    }

    if (sctx->ext.servername_cb != NULL)
        ret = sctx->ext.servername_cb(ssl, &altmp,
                                      sctx->ext.servername_arg);
    else if (s->session_ctx->ext.servername_cb != NULL)
        ret = s->session_ctx->ext.servername_cb(ssl, &altmp,
                                       s->session_ctx->ext.servername_arg);

    
    if (s->server) {
        if (sent && ret == SSL_TLSEXT_ERR_OK && !s->hit) {
            
            OPENSSL_free(s->session->ext.hostname);
            s->session->ext.hostname = OPENSSL_strdup(s->ext.hostname);
            if (s->session->ext.hostname == NULL && s->ext.hostname != NULL) {
                SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
            }
        }
    }

    
    if (SSL_IS_FIRST_HANDSHAKE(s) && sctx != s->session_ctx
            && s->hello_retry_request == SSL_HRR_NONE) {
        ssl_tsan_counter(sctx, &sctx->stats.sess_accept);
        ssl_tsan_decr(s->session_ctx, &s->session_ctx->stats.sess_accept);
    }

    
    if (ret == SSL_TLSEXT_ERR_OK && s->ext.ticket_expected
            && was_ticket && (SSL_get_options(ssl) & SSL_OP_NO_TICKET) != 0) {
        s->ext.ticket_expected = 0;
        if (!s->hit) {
            SSL_SESSION* ss = SSL_get_session(ssl);

            if (ss != NULL) {
                OPENSSL_free(ss->ext.tick);
                ss->ext.tick = NULL;
                ss->ext.ticklen = 0;
                ss->ext.tick_lifetime_hint = 0;
                ss->ext.tick_age_add = 0;
                if (!ssl_generate_session_id(s, ss)) {
                    SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
                    return 0;
                }
            } else {
                SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
                return 0;
            }
        }
    }

    switch (ret) {
    case SSL_TLSEXT_ERR_ALERT_FATAL:
        SSLfatal(s, altmp, SSL_R_CALLBACK_FAILED);
        return 0;

    case SSL_TLSEXT_ERR_ALERT_WARNING:
        
        if (!SSL_CONNECTION_IS_TLS13(s))
            ssl3_send_alert(s, SSL3_AL_WARNING, altmp);
        s->servername_done = 0;
        return 1;

    case SSL_TLSEXT_ERR_NOACK:
        s->servername_done = 0;
        return 1;

    default:
        return 1;
    }
}

static int final_ec_pt_formats(SSL_CONNECTION *s, unsigned int context,
                               int sent)
{
    unsigned long alg_k, alg_a;

    if (s->server)
        return 1;

    alg_k = s->s3.tmp.new_cipher->algorithm_mkey;
    alg_a = s->s3.tmp.new_cipher->algorithm_auth;

    
    if (s->ext.ecpointformats != NULL
            && s->ext.ecpointformats_len > 0
            && s->ext.peer_ecpointformats != NULL
            && s->ext.peer_ecpointformats_len > 0
            && ((alg_k & SSL_kECDHE) || (alg_a & SSL_aECDSA))) {
        
        size_t i;
        unsigned char *list = s->ext.peer_ecpointformats;

        for (i = 0; i < s->ext.peer_ecpointformats_len; i++) {
            if (*list++ == TLSEXT_ECPOINTFORMAT_uncompressed)
                break;
        }
        if (i == s->ext.peer_ecpointformats_len) {
            SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
                     SSL_R_TLS_INVALID_ECPOINTFORMAT_LIST);
            return 0;
        }
    }

    return 1;
}

static int init_session_ticket(SSL_CONNECTION *s, unsigned int context)
{
    if (!s->server)
        s->ext.ticket_expected = 0;

    return 1;
}

#ifndef OPENSSL_NO_OCSP
static int init_status_request(SSL_CONNECTION *s, unsigned int context)
{
    if (s->server) {
        s->ext.status_type = TLSEXT_STATUSTYPE_nothing;
    } else {
        
        OPENSSL_free(s->ext.ocsp.resp);
        s->ext.ocsp.resp = NULL;
        s->ext.ocsp.resp_len = 0;
    }

    return 1;
}
#endif

#ifndef OPENSSL_NO_NEXTPROTONEG
static int init_npn(SSL_CONNECTION *s, unsigned int context)
{
    s->s3.npn_seen = 0;

    return 1;
}
#endif

static int init_alpn(SSL_CONNECTION *s, unsigned int context)
{
    OPENSSL_free(s->s3.alpn_selected);
    s->s3.alpn_selected = NULL;
    s->s3.alpn_selected_len = 0;
    if (s->server) {
        OPENSSL_free(s->s3.alpn_proposed);
        s->s3.alpn_proposed = NULL;
        s->s3.alpn_proposed_len = 0;
    }
    return 1;
}

static int final_alpn(SSL_CONNECTION *s, unsigned int context, int sent)
{
    if (!s->server && !sent && s->session->ext.alpn_selected != NULL)
            s->ext.early_data_ok = 0;

    if (!s->server || !SSL_CONNECTION_IS_TLS13(s))
        return 1;

    
    return tls_handle_alpn(s);
}

static int init_sig_algs(SSL_CONNECTION *s, unsigned int context)
{
    
    OPENSSL_free(s->s3.tmp.peer_sigalgs);
    s->s3.tmp.peer_sigalgs = NULL;
    s->s3.tmp.peer_sigalgslen = 0;

    return 1;
}

static int init_sig_algs_cert(SSL_CONNECTION *s,
                              ossl_unused unsigned int context)
{
    
    OPENSSL_free(s->s3.tmp.peer_cert_sigalgs);
    s->s3.tmp.peer_cert_sigalgs = NULL;
    s->s3.tmp.peer_cert_sigalgslen = 0;

    return 1;
}

#ifndef OPENSSL_NO_SRP
static int init_srp(SSL_CONNECTION *s, unsigned int context)
{
    OPENSSL_free(s->srp_ctx.login);
    s->srp_ctx.login = NULL;

    return 1;
}
#endif

static int init_ec_point_formats(SSL_CONNECTION *s, unsigned int context)
{
    OPENSSL_free(s->ext.peer_ecpointformats);
    s->ext.peer_ecpointformats = NULL;
    s->ext.peer_ecpointformats_len = 0;

    return 1;
}

static int init_etm(SSL_CONNECTION *s, unsigned int context)
{
    s->ext.use_etm = 0;

    return 1;
}

static int init_ems(SSL_CONNECTION *s, unsigned int context)
{
    if (s->s3.flags & TLS1_FLAGS_RECEIVED_EXTMS) {
        s->s3.flags &= ~TLS1_FLAGS_RECEIVED_EXTMS;
        s->s3.flags |= TLS1_FLAGS_REQUIRED_EXTMS;
    }

    return 1;
}

static int final_ems(SSL_CONNECTION *s, unsigned int context, int sent)
{
    
    if (!(s->s3.flags & TLS1_FLAGS_RECEIVED_EXTMS)
        && (s->s3.flags & TLS1_FLAGS_REQUIRED_EXTMS)) {
        SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_R_INCONSISTENT_EXTMS);
        return 0;
    }
    if (!s->server && s->hit) {
        
        if (!(s->s3.flags & TLS1_FLAGS_RECEIVED_EXTMS) !=
            !(s->session->flags & SSL_SESS_FLAG_EXTMS)) {
            SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, SSL_R_INCONSISTENT_EXTMS);
            return 0;
        }
    }

    return 1;
}

static int init_certificate_authorities(SSL_CONNECTION *s, unsigned int context)
{
    sk_X509_NAME_pop_free(s->s3.tmp.peer_ca_names, X509_NAME_free);
    s->s3.tmp.peer_ca_names = NULL;
    return 1;
}

static EXT_RETURN tls_construct_certificate_authorities(SSL_CONNECTION *s,
                                                        WPACKET *pkt,
                                                        unsigned int context,
                                                        X509 *x,
                                                        size_t chainidx)
{
    const STACK_OF(X509_NAME) *ca_sk = get_ca_names(s);

    if (ca_sk == NULL || sk_X509_NAME_num(ca_sk) == 0)
        return EXT_RETURN_NOT_SENT;

    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_certificate_authorities)
        || !WPACKET_start_sub_packet_u16(pkt)) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        return EXT_RETURN_FAIL;
    }

    if (!construct_ca_names(s, ca_sk, pkt)) {
        
        return EXT_RETURN_FAIL;
    }

    if (!WPACKET_close(pkt)) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        return EXT_RETURN_FAIL;
    }

    return EXT_RETURN_SENT;
}

static int tls_parse_certificate_authorities(SSL_CONNECTION *s, PACKET *pkt,
                                             unsigned int context, X509 *x,
                                             size_t chainidx)
{
    if (!parse_ca_names(s, pkt))
        return 0;
    if (PACKET_remaining(pkt) != 0) {
        SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_BAD_EXTENSION);
        return 0;
    }
    return 1;
}

#ifndef OPENSSL_NO_SRTP
static int init_srtp(SSL_CONNECTION *s, unsigned int context)
{
    if (s->server)
        s->srtp_profile = NULL;

    return 1;
}
#endif

static int final_sig_algs(SSL_CONNECTION *s, unsigned int context, int sent)
{
    if (!sent && SSL_CONNECTION_IS_TLS13(s) && !s->hit) {
        SSLfatal(s, TLS13_AD_MISSING_EXTENSION,
                 SSL_R_MISSING_SIGALGS_EXTENSION);
        return 0;
    }

    return 1;
}

static int final_key_share(SSL_CONNECTION *s, unsigned int context, int sent)
{
#if !defined(OPENSSL_NO_TLS1_3)
    if (!SSL_CONNECTION_IS_TLS13(s))
        return 1;

    
    if ((context & SSL_EXT_TLS1_3_HELLO_RETRY_REQUEST) != 0)
        return 1;

    
    if (!s->server
            && !sent
            && (!s->hit
                || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE) == 0)) {
        
        SSLfatal(s, SSL_AD_MISSING_EXTENSION, SSL_R_NO_SUITABLE_KEY_SHARE);
        return 0;
    }
    
    if (s->server) {
        if (s->s3.peer_tmp != NULL) {
            
            if ((s->s3.flags & TLS1_FLAGS_STATELESS) != 0
                    && !s->ext.cookieok) {
                if (!ossl_assert(s->hello_retry_request == SSL_HRR_NONE)) {
                    
                    SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
                    return 0;
                }
                s->hello_retry_request = SSL_HRR_PENDING;
                return 1;
            }
        } else {
            
            if (s->hello_retry_request == SSL_HRR_NONE && sent
                    && (!s->hit
                        || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE_DHE)
                           != 0)) {
                const uint16_t *pgroups, *clntgroups;
                size_t num_groups, clnt_num_groups, i;
                unsigned int group_id = 0;

                

                
                tls1_get_peer_groups(s, &clntgroups, &clnt_num_groups);
                tls1_get_supported_groups(s, &pgroups, &num_groups);

                
                for (i = 0; i < num_groups; i++) {
                    group_id = pgroups[i];

                    if (check_in_list(s, group_id, clntgroups, clnt_num_groups,
                                      1)
                            && tls_group_allowed(s, group_id,
                                                 SSL_SECOP_CURVE_SUPPORTED)
                            && tls_valid_group(s, group_id, TLS1_3_VERSION,
                                               TLS1_3_VERSION, 0, NULL))
                        break;
                }

                if (i < num_groups) {
                    
                    s->s3.group_id = group_id;
                    s->hello_retry_request = SSL_HRR_PENDING;
                    return 1;
                }
            }
            if (!s->hit
                    || (s->ext.psk_kex_mode & TLSEXT_KEX_MODE_FLAG_KE) == 0) {
                
                SSLfatal(s, sent ? SSL_AD_HANDSHAKE_FAILURE
                                 : SSL_AD_MISSING_EXTENSION,
                         SSL_R_NO_SUITABLE_KEY_SHARE);
                return 0;
            }

            if ((s->s3.flags & TLS1_FLAGS_STATELESS) != 0
                    && !s->ext.cookieok) {
                if (!ossl_assert(s->hello_retry_request == SSL_HRR_NONE)) {
                    
                    SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
                    return 0;
                }
                s->hello_retry_request = SSL_HRR_PENDING;
                return 1;
            }
        }

        
        if (s->hello_retry_request == SSL_HRR_PENDING)
            s->hello_retry_request = SSL_HRR_COMPLETE;
    } else {
        
        if (!sent && !tls13_generate_handshake_secret(s, NULL, 0)) {
            SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
            return 0;
        }
    }
#endif 
    return 1;
}

static int init_psk_kex_modes(SSL_CONNECTION *s, unsigned int context)
{
    s->ext.psk_kex_mode = TLSEXT_KEX_MODE_FLAG_NONE;
    return 1;
}

int tls_psk_do_binder(SSL_CONNECTION *s, const EVP_MD *md,
                      const unsigned char *msgstart,
                      size_t binderoffset, const unsigned char *binderin,
                      unsigned char *binderout, SSL_SESSION *sess, int sign,
                      int external)
{
    EVP_PKEY *mackey = NULL;
    EVP_MD_CTX *mctx = NULL;
    unsigned char hash[EVP_MAX_MD_SIZE], binderkey[EVP_MAX_MD_SIZE];
    unsigned char finishedkey[EVP_MAX_MD_SIZE], tmpbinder[EVP_MAX_MD_SIZE];
    unsigned char *early_secret;
    
    static const unsigned char resumption_label[] = "\x72\x65\x73\x20\x62\x69\x6E\x64\x65\x72";
    
    static const unsigned char external_label[] = "\x65\x78\x74\x20\x62\x69\x6E\x64\x65\x72";
    const unsigned char *label;
    size_t bindersize, labelsize, hashsize;
    int hashsizei = EVP_MD_get_size(md);
    int ret = -1;
    int usepskfored = 0;
    SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s);

    
    if (!ossl_assert(hashsizei >= 0)) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        goto err;
    }
    hashsize = (size_t)hashsizei;

    if (external
            && s->early_data_state == SSL_EARLY_DATA_CONNECTING
            && s->session->ext.max_early_data == 0
            && sess->ext.max_early_data > 0)
        usepskfored = 1;

    if (external) {
        label = external_label;
        labelsize = sizeof(external_label) - 1;
    } else {
        label = resumption_label;
        labelsize = sizeof(resumption_label) - 1;
    }

    
    if (s->server || !external || usepskfored)
        early_secret = (unsigned char *)s->early_secret;
    else
        early_secret = (unsigned char *)sess->early_secret;

    if (!tls13_generate_secret(s, md, NULL, sess->master_key,
                               sess->master_key_length, early_secret)) {
        
        goto err;
    }

    
    mctx = EVP_MD_CTX_new();
    if (mctx == NULL
            || EVP_DigestInit_ex(mctx, md, NULL) <= 0
            || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        goto err;
    }

    
    if (!tls13_hkdf_expand(s, md, early_secret, label, labelsize, hash,
                           hashsize, binderkey, hashsize, 1)) {
        
        goto err;
    }

    
    if (!tls13_derive_finishedkey(s, md, binderkey, finishedkey, hashsize)) {
        
        goto err;
    }

    if (EVP_DigestInit_ex(mctx, md, NULL) <= 0) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        goto err;
    }

    
    if (s->hello_retry_request == SSL_HRR_PENDING) {
        size_t hdatalen;
        long hdatalen_l;
        void *hdata;

        hdatalen = hdatalen_l =
            BIO_get_mem_data(s->s3.handshake_buffer, &hdata);
        if (hdatalen_l <= 0) {
            SSLfatal(s, SSL_AD_INTERNAL_ERROR, SSL_R_BAD_HANDSHAKE_LENGTH);
            goto err;
        }

        
        if (s->server) {
            PACKET hashprefix, msg;

            
            if (!PACKET_buf_init(&hashprefix, hdata, hdatalen)
                    || !PACKET_forward(&hashprefix, 1)
                    || !PACKET_get_length_prefixed_3(&hashprefix, &msg)
                    || !PACKET_forward(&hashprefix, 1)
                    || !PACKET_get_length_prefixed_3(&hashprefix, &msg)) {
                SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
                goto err;
            }
            hdatalen -= PACKET_remaining(&hashprefix);
        }

        if (EVP_DigestUpdate(mctx, hdata, hdatalen) <= 0) {
            SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
            goto err;
        }
    }

    if (EVP_DigestUpdate(mctx, msgstart, binderoffset) <= 0
            || EVP_DigestFinal_ex(mctx, hash, NULL) <= 0) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        goto err;
    }

    mackey = EVP_PKEY_new_raw_private_key_ex(sctx->libctx, "HMAC",
                                             sctx->propq, finishedkey,
                                             hashsize);
    if (mackey == NULL) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        goto err;
    }

    if (!sign)
        binderout = tmpbinder;

    bindersize = hashsize;
    if (EVP_DigestSignInit_ex(mctx, NULL, EVP_MD_get0_name(md), sctx->libctx,
                              sctx->propq, mackey, NULL) <= 0
            || EVP_DigestSignUpdate(mctx, hash, hashsize) <= 0
            || EVP_DigestSignFinal(mctx, binderout, &bindersize) <= 0
            || bindersize != hashsize) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        goto err;
    }

    if (sign) {
        ret = 1;
    } else {
        
        ret = (CRYPTO_memcmp(binderin, binderout, hashsize) == 0);
        if (!ret)
            SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BINDER_DOES_NOT_VERIFY);
    }

 err:
    OPENSSL_cleanse(binderkey, sizeof(binderkey));
    OPENSSL_cleanse(finishedkey, sizeof(finishedkey));
    EVP_PKEY_free(mackey);
    EVP_MD_CTX_free(mctx);

    return ret;
}

static int final_early_data(SSL_CONNECTION *s, unsigned int context, int sent)
{
    if (!sent)
        return 1;

    if (!s->server) {
        if (context == SSL_EXT_TLS1_3_ENCRYPTED_EXTENSIONS
                && sent
                && !s->ext.early_data_ok) {
            
            SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BAD_EARLY_DATA);
            return 0;
        }

        return 1;
    }

    if (s->max_early_data == 0
            || !s->hit
            || s->early_data_state != SSL_EARLY_DATA_ACCEPTING
            || !s->ext.early_data_ok
            || s->hello_retry_request != SSL_HRR_NONE
            || (s->allow_early_data_cb != NULL
                && !s->allow_early_data_cb(SSL_CONNECTION_GET_SSL(s),
                                         s->allow_early_data_cb_data))) {
        s->ext.early_data = SSL_EARLY_DATA_REJECTED;
    } else {
        s->ext.early_data = SSL_EARLY_DATA_ACCEPTED;

        if (!tls13_change_cipher_state(s,
                    SSL3_CC_EARLY | SSL3_CHANGE_CIPHER_SERVER_READ)) {
            
            return 0;
        }
    }

    return 1;
}

static int final_maxfragmentlen(SSL_CONNECTION *s, unsigned int context,
                                int sent)
{
    
    if (s->server && s->hit && USE_MAX_FRAGMENT_LENGTH_EXT(s->session)
            && !sent ) {
        SSLfatal(s, SSL_AD_MISSING_EXTENSION, SSL_R_BAD_EXTENSION);
        return 0;
    }

    if (s->session && USE_MAX_FRAGMENT_LENGTH_EXT(s->session)) {
        s->rlayer.rrlmethod->set_max_frag_len(s->rlayer.rrl,
                                              GET_MAX_FRAGMENT_LENGTH(s->session));
        s->rlayer.wrlmethod->set_max_frag_len(s->rlayer.wrl,
                                              ssl_get_max_send_fragment(s));
    }

    return 1;
}

static int init_post_handshake_auth(SSL_CONNECTION *s,
                                    ossl_unused unsigned int context)
{
    s->post_handshake_auth = SSL_PHA_NONE;

    return 1;
}


static int final_psk(SSL_CONNECTION *s, unsigned int context, int sent)
{
    if (s->server && sent && s->clienthello != NULL
            && !s->clienthello->pre_proc_exts[TLSEXT_IDX_psk_kex_modes].present) {
        SSLfatal(s, TLS13_AD_MISSING_EXTENSION,
                 SSL_R_MISSING_PSK_KEX_MODES_EXTENSION);
        return 0;
    }

    return 1;
}

static int tls_init_compress_certificate(SSL_CONNECTION *sc, unsigned int context)
{
    memset(sc->ext.compress_certificate_from_peer, 0,
           sizeof(sc->ext.compress_certificate_from_peer));
    return 1;
}


static EXT_RETURN tls_construct_compress_certificate(SSL_CONNECTION *sc, WPACKET *pkt,
                                                     unsigned int context,
                                                     X509 *x, size_t chainidx)
{
#ifndef OPENSSL_NO_COMP_ALG
    int i;

    if (!ossl_comp_has_alg(0))
        return EXT_RETURN_NOT_SENT;

    
    if (sc->server && sc->ext.server_cert_type != TLSEXT_cert_type_x509) {
        sc->cert_comp_prefs[0] = TLSEXT_comp_cert_none;
        return EXT_RETURN_NOT_SENT;
    }

    
    if (!sc->server && sc->ext.client_cert_type_ctos) {
        sc->cert_comp_prefs[0] = TLSEXT_comp_cert_none;
        return EXT_RETURN_NOT_SENT;
    }

    
    if ((sc->options & SSL_OP_NO_RX_CERTIFICATE_COMPRESSION) != 0)
        return EXT_RETURN_NOT_SENT;

    if (sc->cert_comp_prefs[0] == TLSEXT_comp_cert_none)
        return EXT_RETURN_NOT_SENT;

    if (!WPACKET_put_bytes_u16(pkt, TLSEXT_TYPE_compress_certificate)
            || !WPACKET_start_sub_packet_u16(pkt)
            || !WPACKET_start_sub_packet_u8(pkt))
        goto err;

    for (i = 0; sc->cert_comp_prefs[i] != TLSEXT_comp_cert_none; i++) {
        if (!WPACKET_put_bytes_u16(pkt, sc->cert_comp_prefs[i]))
            goto err;
    }
    if (!WPACKET_close(pkt) || !WPACKET_close(pkt))
        goto err;

    sc->ext.compress_certificate_sent = 1;
    return EXT_RETURN_SENT;
 err:
    SSLfatal(sc, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
    return EXT_RETURN_FAIL;
#else
    return EXT_RETURN_NOT_SENT;
#endif
}

#ifndef OPENSSL_NO_COMP_ALG
static int tls_comp_in_pref(SSL_CONNECTION *sc, int alg)
{
    int i;

    
    if (alg == 0)
        return 0;
    
    if (!ossl_comp_has_alg(alg))
        return 0;
    
    if (sc->cert_comp_prefs[0] == TLSEXT_comp_cert_none)
        return 1;
    
    for (i = 0; i < TLSEXT_comp_cert_limit; i++)
        if (sc->cert_comp_prefs[i] == alg)
            return 1;
    return 0;
}
#endif

int tls_parse_compress_certificate(SSL_CONNECTION *sc, PACKET *pkt, unsigned int context,
                                   X509 *x, size_t chainidx)
{
#ifndef OPENSSL_NO_COMP_ALG
    PACKET supported_comp_algs;
    unsigned int comp;
    int already_set[TLSEXT_comp_cert_limit];
    int j = 0;

    
    if (!ossl_comp_has_alg(0))
        return 1;

    
    if (sc->server && sc->ext.server_cert_type != TLSEXT_cert_type_x509)
        return 1;
    if (!sc->server && sc->ext.client_cert_type != TLSEXT_cert_type_x509)
        return 1;

    
    if ((sc->options & SSL_OP_NO_TX_CERTIFICATE_COMPRESSION) != 0)
        return 1;

    if (!PACKET_as_length_prefixed_1(pkt, &supported_comp_algs)
            || PACKET_remaining(&supported_comp_algs) == 0) {
        SSLfatal(sc, SSL_AD_DECODE_ERROR, SSL_R_BAD_EXTENSION);
        return 0;
    }

    memset(already_set, 0, sizeof(already_set));
    
    while (PACKET_get_net_2(&supported_comp_algs, &comp)) {
        if (tls_comp_in_pref(sc, comp) && !already_set[comp]) {
            sc->ext.compress_certificate_from_peer[j++] = comp;
            already_set[comp] = 1;
        }
    }
#endif
    return 1;
}

static int init_server_cert_type(SSL_CONNECTION *sc, unsigned int context)
{
    
    if (sc->server) {
        sc->ext.server_cert_type_ctos = OSSL_CERT_TYPE_CTOS_NONE;
        sc->ext.server_cert_type = TLSEXT_cert_type_x509;
    }
    return 1;
}

static int init_client_cert_type(SSL_CONNECTION *sc, unsigned int context)
{
    
    if (sc->server) {
        sc->ext.client_cert_type_ctos = OSSL_CERT_TYPE_CTOS_NONE;
        sc->ext.client_cert_type = TLSEXT_cert_type_x509;
    }
    return 1;
}
