

#include <limits.h>
#include <string.h>
#include <stdio.h>
#include "../ssl_local.h"
#include "statem_local.h"
#include "internal/cryptlib.h"
#include <openssl/buffer.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include <openssl/rsa.h>
#include <openssl/x509.h>
#include <openssl/trace.h>
#include <openssl/encoder.h>


typedef struct x509err2alert_st {
    int x509err;
    int alert;
} X509ERR2ALERT;


const unsigned char hrrrandom[] = {
    0xcf, 0x21, 0xad, 0x74, 0xe5, 0x9a, 0x61, 0x11, 0xbe, 0x1d, 0x8c, 0x02,
    0x1e, 0x65, 0xb8, 0x91, 0xc2, 0xa2, 0x11, 0x16, 0x7a, 0xbb, 0x8c, 0x5e,
    0x07, 0x9e, 0x09, 0xe2, 0xc8, 0xa8, 0x33, 0x9c
};

int ossl_statem_set_mutator(SSL *s,
                            ossl_statem_mutate_handshake_cb mutate_handshake_cb,
                            ossl_statem_finish_mutate_handshake_cb finish_mutate_handshake_cb,
                            void *mutatearg)
{
    SSL_CONNECTION *sc = SSL_CONNECTION_FROM_SSL(s);

    if (sc == NULL)
        return 0;

    sc->statem.mutate_handshake_cb = mutate_handshake_cb;
    sc->statem.mutatearg = mutatearg;
    sc->statem.finish_mutate_handshake_cb = finish_mutate_handshake_cb;

    return 1;
}


int ssl3_do_write(SSL_CONNECTION *s, uint8_t type)
{
    int ret;
    size_t written = 0;
    SSL *ssl = SSL_CONNECTION_GET_SSL(s);

    
    if (s->statem.mutate_handshake_cb != NULL
            && !s->statem.write_in_progress
            && type == SSL3_RT_HANDSHAKE
            && s->init_num >= SSL3_HM_HEADER_LENGTH) {
        unsigned char *msg;
        size_t msglen;

        if (!s->statem.mutate_handshake_cb((unsigned char *)s->init_buf->data,
                                           s->init_num,
                                           &msg, &msglen,
                                           s->statem.mutatearg))
            return -1;
        if (msglen < SSL3_HM_HEADER_LENGTH
                || !BUF_MEM_grow(s->init_buf, msglen))
            return -1;
        memcpy(s->init_buf->data, msg, msglen);
        s->init_num = msglen;
        s->init_msg = s->init_buf->data + SSL3_HM_HEADER_LENGTH;
        s->statem.finish_mutate_handshake_cb(s->statem.mutatearg);
        s->statem.write_in_progress = 1;
    }

    ret = ssl3_write_bytes(ssl, type, &s->init_buf->data[s->init_off],
                           s->init_num, &written);
    if (ret <= 0)
        return -1;
    if (type == SSL3_RT_HANDSHAKE)
        
        if (!SSL_CONNECTION_IS_TLS13(s)
            || (s->statem.hand_state != TLS_ST_SW_SESSION_TICKET
                                 && s->statem.hand_state != TLS_ST_CW_KEY_UPDATE
                                 && s->statem.hand_state != TLS_ST_SW_KEY_UPDATE))
            if (!ssl3_finish_mac(s,
                                 (unsigned char *)&s->init_buf->data[s->init_off],
                                 written))
                return -1;
    if (written == s->init_num) {
        s->statem.write_in_progress = 0;
        if (s->msg_callback)
            s->msg_callback(1, s->version, type, s->init_buf->data,
                            (size_t)(s->init_off + s->init_num), ssl,
                            s->msg_callback_arg);
        return 1;
    }
    s->init_off += written;
    s->init_num -= written;
    return 0;
}

int tls_close_construct_packet(SSL_CONNECTION *s, WPACKET *pkt, int htype)
{
    size_t msglen;

    if ((htype != SSL3_MT_CHANGE_CIPHER_SPEC && !WPACKET_close(pkt))
            || !WPACKET_get_length(pkt, &msglen)
            || msglen > INT_MAX)
        return 0;
    s->init_num = (int)msglen;
    s->init_off = 0;

    return 1;
}

int tls_setup_handshake(SSL_CONNECTION *s)
{
    int ver_min, ver_max, ok;
    SSL *ssl = SSL_CONNECTION_GET_SSL(s);
    SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s);

    if (!ssl3_init_finished_mac(s)) {
        
        return 0;
    }

    
    memset(s->ext.extflags, 0, sizeof(s->ext.extflags));

    if (ssl_get_min_max_version(s, &ver_min, &ver_max, NULL) != 0) {
        SSLfatal(s, SSL_AD_PROTOCOL_VERSION, SSL_R_NO_PROTOCOLS_AVAILABLE);
        return 0;
    }

    
    if (sctx->ssl_digest_methods[SSL_MD_MD5_SHA1_IDX] == NULL) {
        int negotiated_minversion;
        int md5sha1_needed_maxversion = SSL_CONNECTION_IS_DTLS(s)
                                        ? DTLS1_VERSION : TLS1_1_VERSION;

        
        if (ssl_version_cmp(s, ver_max, md5sha1_needed_maxversion) <= 0) {
            SSLfatal_data(s, SSL_AD_HANDSHAKE_FAILURE,
                          SSL_R_NO_SUITABLE_DIGEST_ALGORITHM,
                          "The max supported SSL/TLS version needs the"
                          " MD5-SHA1 digest but it is not available"
                          " in the loaded providers. Use (D)TLSv1.2 or"
                          " above, or load different providers");
            return 0;
        }

        ok = 1;

        
        negotiated_minversion = SSL_CONNECTION_IS_DTLS(s) ?
                                DTLS1_2_VERSION : TLS1_2_VERSION;
        if (ssl_version_cmp(s, ver_min, negotiated_minversion) < 0)
                ok = SSL_set_min_proto_version(ssl, negotiated_minversion);
        if (!ok) {
            
            SSLfatal(s, SSL_AD_HANDSHAKE_FAILURE, ERR_R_INTERNAL_ERROR);
            return 0;
        }
    }

    ok = 0;
    if (s->server) {
        STACK_OF(SSL_CIPHER) *ciphers = SSL_get_ciphers(ssl);
        int i;

        
        for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
            const SSL_CIPHER *c = sk_SSL_CIPHER_value(ciphers, i);
            int cipher_minprotover = SSL_CONNECTION_IS_DTLS(s)
                                     ? c->min_dtls : c->min_tls;
            int cipher_maxprotover = SSL_CONNECTION_IS_DTLS(s)
                                     ? c->max_dtls : c->max_tls;

            if (ssl_version_cmp(s, ver_max, cipher_minprotover) >= 0
                    && ssl_version_cmp(s, ver_max, cipher_maxprotover) <= 0) {
                ok = 1;
                break;
            }
        }
        if (!ok) {
            SSLfatal_data(s, SSL_AD_HANDSHAKE_FAILURE,
                          SSL_R_NO_CIPHERS_AVAILABLE,
                          "No ciphers enabled for max supported "
                          "SSL/TLS version");
            return 0;
        }
        if (SSL_IS_FIRST_HANDSHAKE(s)) {
            
            ssl_tsan_counter(s->session_ctx, &s->session_ctx->stats.sess_accept);
        } else {
            
            ssl_tsan_counter(sctx, &sctx->stats.sess_accept_renegotiate);

            s->s3.tmp.cert_request = 0;
        }
    } else {
        if (SSL_IS_FIRST_HANDSHAKE(s))
            ssl_tsan_counter(s->session_ctx, &s->session_ctx->stats.sess_connect);
        else
            ssl_tsan_counter(s->session_ctx,
                         &s->session_ctx->stats.sess_connect_renegotiate);

        
        memset(s->s3.client_random, 0, sizeof(s->s3.client_random));
        s->hit = 0;

        s->s3.tmp.cert_req = 0;

        if (SSL_CONNECTION_IS_DTLS(s))
            s->statem.use_timer = 1;
    }

    return 1;
}


#define TLS13_TBS_START_SIZE            64
#define TLS13_TBS_PREAMBLE_SIZE         (TLS13_TBS_START_SIZE + 33 + 1)

static int get_cert_verify_tbs_data(SSL_CONNECTION *s, unsigned char *tls13tbs,
                                    void **hdata, size_t *hdatalen)
{
    
    static const char servercontext[] = "\x54\x4c\x53\x20\x31\x2e\x33\x2c\x20\x73\x65\x72"
        "\x76\x65\x72\x20\x43\x65\x72\x74\x69\x66\x69\x63\x61\x74\x65\x56\x65\x72\x69\x66\x79";
    
    static const char clientcontext[] = "\x54\x4c\x53\x20\x31\x2e\x33\x2c\x20\x63\x6c\x69"
        "\x65\x6e\x74\x20\x43\x65\x72\x74\x69\x66\x69\x63\x61\x74\x65\x56\x65\x72\x69\x66\x79";

    if (SSL_CONNECTION_IS_TLS13(s)) {
        size_t hashlen;

        
        memset(tls13tbs, 32, TLS13_TBS_START_SIZE);
        
        if (s->statem.hand_state == TLS_ST_CR_CERT_VRFY
                 || s->statem.hand_state == TLS_ST_SW_CERT_VRFY)
            strcpy((char *)tls13tbs + TLS13_TBS_START_SIZE, servercontext);
        else
            strcpy((char *)tls13tbs + TLS13_TBS_START_SIZE, clientcontext);

        
        if (s->statem.hand_state == TLS_ST_CR_CERT_VRFY
                || s->statem.hand_state == TLS_ST_SR_CERT_VRFY) {
            memcpy(tls13tbs + TLS13_TBS_PREAMBLE_SIZE, s->cert_verify_hash,
                   s->cert_verify_hash_len);
            hashlen = s->cert_verify_hash_len;
        } else if (!ssl_handshake_hash(s, tls13tbs + TLS13_TBS_PREAMBLE_SIZE,
                                       EVP_MAX_MD_SIZE, &hashlen)) {
            
            return 0;
        }

        *hdata = tls13tbs;
        *hdatalen = TLS13_TBS_PREAMBLE_SIZE + hashlen;
    } else {
        size_t retlen;
        long retlen_l;

        retlen = retlen_l = BIO_get_mem_data(s->s3.handshake_buffer, hdata);
        if (retlen_l <= 0) {
            SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
            return 0;
        }
        *hdatalen = retlen;
    }

    return 1;
}

CON_FUNC_RETURN tls_construct_cert_verify(SSL_CONNECTION *s, WPACKET *pkt)
{
    EVP_PKEY *pkey = NULL;
    const EVP_MD *md = NULL;
    EVP_MD_CTX *mctx = NULL;
    EVP_PKEY_CTX *pctx = NULL;
    size_t hdatalen = 0, siglen = 0;
    void *hdata;
    unsigned char *sig = NULL;
    unsigned char tls13tbs[TLS13_TBS_PREAMBLE_SIZE + EVP_MAX_MD_SIZE];
    const SIGALG_LOOKUP *lu = s->s3.tmp.sigalg;
    SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s);

    if (lu == NULL || s->s3.tmp.cert == NULL) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        goto err;
    }
    pkey = s->s3.tmp.cert->privatekey;

    if (pkey == NULL || !tls1_lookup_md(sctx, lu, &md)) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        goto err;
    }

    mctx = EVP_MD_CTX_new();
    if (mctx == NULL) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
        goto err;
    }

    
    if (!get_cert_verify_tbs_data(s, tls13tbs, &hdata, &hdatalen)) {
        
        goto err;
    }

    if (SSL_USE_SIGALGS(s) && !WPACKET_put_bytes_u16(pkt, lu->sigalg)) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        goto err;
    }

    if (EVP_DigestSignInit_ex(mctx, &pctx,
                              md == NULL ? NULL : EVP_MD_get0_name(md),
                              sctx->libctx, sctx->propq, pkey,
                              NULL) <= 0) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
        goto err;
    }

    if (lu->sig == EVP_PKEY_RSA_PSS) {
        if (EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) <= 0
            || EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx,
                                                RSA_PSS_SALTLEN_DIGEST) <= 0) {
            SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
            goto err;
        }
    }
    if (s->version == SSL3_VERSION) {
        
        if (EVP_DigestSignUpdate(mctx, hdata, hdatalen) <= 0
            || EVP_MD_CTX_ctrl(mctx, EVP_CTRL_SSL3_MASTER_SECRET,
                               (int)s->session->master_key_length,
                               s->session->master_key) <= 0
            || EVP_DigestSignFinal(mctx, NULL, &siglen) <= 0) {

            SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
            goto err;
        }
        sig = OPENSSL_malloc(siglen);
        if (sig == NULL
                || EVP_DigestSignFinal(mctx, sig, &siglen) <= 0) {
            SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
            goto err;
        }
    } else {
        
        if (EVP_DigestSign(mctx, NULL, &siglen, hdata, hdatalen) <= 0) {
            SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
            goto err;
        }
        sig = OPENSSL_malloc(siglen);
        if (sig == NULL
                || EVP_DigestSign(mctx, sig, &siglen, hdata, hdatalen) <= 0) {
            SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
            goto err;
        }
    }

#ifndef OPENSSL_NO_GOST
    {
        int pktype = lu->sig;

        if (pktype == NID_id_GostR3410_2001
            || pktype == NID_id_GostR3410_2012_256
            || pktype == NID_id_GostR3410_2012_512)
            BUF_reverse(sig, NULL, siglen);
    }
#endif

    if (!WPACKET_sub_memcpy_u16(pkt, sig, siglen)) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        goto err;
    }

    
    if (!ssl3_digest_cached_records(s, 0)) {
        
        goto err;
    }

    OPENSSL_free(sig);
    EVP_MD_CTX_free(mctx);
    return CON_FUNC_SUCCESS;
 err:
    OPENSSL_free(sig);
    EVP_MD_CTX_free(mctx);
    return CON_FUNC_ERROR;
}

MSG_PROCESS_RETURN tls_process_cert_verify(SSL_CONNECTION *s, PACKET *pkt)
{
    EVP_PKEY *pkey = NULL;
    const unsigned char *data;
#ifndef OPENSSL_NO_GOST
    unsigned char *gost_data = NULL;
#endif
    MSG_PROCESS_RETURN ret = MSG_PROCESS_ERROR;
    int j;
    unsigned int len;
    const EVP_MD *md = NULL;
    size_t hdatalen = 0;
    void *hdata;
    unsigned char tls13tbs[TLS13_TBS_PREAMBLE_SIZE + EVP_MAX_MD_SIZE];
    EVP_MD_CTX *mctx = EVP_MD_CTX_new();
    EVP_PKEY_CTX *pctx = NULL;
    SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s);

    if (mctx == NULL) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
        goto err;
    }

    pkey = tls_get_peer_pkey(s);
    if (pkey == NULL) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        goto err;
    }

    if (ssl_cert_lookup_by_pkey(pkey, NULL, sctx) == NULL) {
        SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
                 SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
        goto err;
    }

    if (SSL_USE_SIGALGS(s)) {
        unsigned int sigalg;

        if (!PACKET_get_net_2(pkt, &sigalg)) {
            SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_BAD_PACKET);
            goto err;
        }
        if (tls12_check_peer_sigalg(s, sigalg, pkey) <= 0) {
            
            goto err;
        }
    } else if (!tls1_set_peer_legacy_sigalg(s, pkey)) {
            SSLfatal(s, SSL_AD_INTERNAL_ERROR,
                     SSL_R_LEGACY_SIGALG_DISALLOWED_OR_UNSUPPORTED);
            goto err;
    }

    if (!tls1_lookup_md(sctx, s->s3.tmp.peer_sigalg, &md)) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        goto err;
    }

    if (SSL_USE_SIGALGS(s))
        OSSL_TRACE1(TLS, "USING TLSv1.2 HASH %s\n",
                    md == NULL ? "n/a" : EVP_MD_get0_name(md));

    
    
#ifndef OPENSSL_NO_GOST
    if (!SSL_USE_SIGALGS(s)
        && ((PACKET_remaining(pkt) == 64
             && (EVP_PKEY_get_id(pkey) == NID_id_GostR3410_2001
                 || EVP_PKEY_get_id(pkey) == NID_id_GostR3410_2012_256))
            || (PACKET_remaining(pkt) == 128
                && EVP_PKEY_get_id(pkey) == NID_id_GostR3410_2012_512))) {
        len = PACKET_remaining(pkt);
    } else
#endif
    if (!PACKET_get_net_2(pkt, &len)) {
        SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
        goto err;
    }

    if (!PACKET_get_bytes(pkt, &data, len)) {
        SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
        goto err;
    }

    if (!get_cert_verify_tbs_data(s, tls13tbs, &hdata, &hdatalen)) {
        
        goto err;
    }

    OSSL_TRACE1(TLS, "Using client verify alg %s\n",
                md == NULL ? "n/a" : EVP_MD_get0_name(md));

    if (EVP_DigestVerifyInit_ex(mctx, &pctx,
                                md == NULL ? NULL : EVP_MD_get0_name(md),
                                sctx->libctx, sctx->propq, pkey,
                                NULL) <= 0) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
        goto err;
    }
#ifndef OPENSSL_NO_GOST
    {
        int pktype = EVP_PKEY_get_id(pkey);
        if (pktype == NID_id_GostR3410_2001
            || pktype == NID_id_GostR3410_2012_256
            || pktype == NID_id_GostR3410_2012_512) {
            if ((gost_data = OPENSSL_malloc(len)) == NULL)
                goto err;
            BUF_reverse(gost_data, data, len);
            data = gost_data;
        }
    }
#endif

    if (SSL_USE_PSS(s)) {
        if (EVP_PKEY_CTX_set_rsa_padding(pctx, RSA_PKCS1_PSS_PADDING) <= 0
            || EVP_PKEY_CTX_set_rsa_pss_saltlen(pctx,
                                                RSA_PSS_SALTLEN_DIGEST) <= 0) {
            SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
            goto err;
        }
    }
    if (s->version == SSL3_VERSION) {
        if (EVP_DigestVerifyUpdate(mctx, hdata, hdatalen) <= 0
                || EVP_MD_CTX_ctrl(mctx, EVP_CTRL_SSL3_MASTER_SECRET,
                                   (int)s->session->master_key_length,
                                    s->session->master_key) <= 0) {
            SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_EVP_LIB);
            goto err;
        }
        if (EVP_DigestVerifyFinal(mctx, data, len) <= 0) {
            SSLfatal(s, SSL_AD_DECRYPT_ERROR, SSL_R_BAD_SIGNATURE);
            goto err;
        }
    } else {
        j = EVP_DigestVerify(mctx, data, len, hdata, hdatalen);
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
        
        if (SSL_IS_QUIC_HANDSHAKE(s))
            j = 1;
#endif
        if (j <= 0) {
            SSLfatal(s, SSL_AD_DECRYPT_ERROR, SSL_R_BAD_SIGNATURE);
            goto err;
        }
    }

    
    if (!s->server && SSL_CONNECTION_IS_TLS13(s) && s->s3.tmp.cert_req == 1)
        ret = MSG_PROCESS_CONTINUE_PROCESSING;
    else
        ret = MSG_PROCESS_CONTINUE_READING;
 err:
    BIO_free(s->s3.handshake_buffer);
    s->s3.handshake_buffer = NULL;
    EVP_MD_CTX_free(mctx);
#ifndef OPENSSL_NO_GOST
    OPENSSL_free(gost_data);
#endif
    return ret;
}

CON_FUNC_RETURN tls_construct_finished(SSL_CONNECTION *s, WPACKET *pkt)
{
    size_t finish_md_len;
    const char *sender;
    size_t slen;
    SSL *ssl = SSL_CONNECTION_GET_SSL(s);

    
    if (!s->server && s->post_handshake_auth != SSL_PHA_REQUESTED)
        s->statem.cleanuphand = 1;

    
    if (SSL_CONNECTION_IS_TLS13(s)
            && !s->server
            && (s->early_data_state != SSL_EARLY_DATA_NONE
                || (s->options & SSL_OP_ENABLE_MIDDLEBOX_COMPAT) != 0)
            && s->s3.tmp.cert_req == 0
            && (!ssl->method->ssl3_enc->change_cipher_state(s,
                    SSL3_CC_HANDSHAKE | SSL3_CHANGE_CIPHER_CLIENT_WRITE))) {;
        
        return CON_FUNC_ERROR;
    }

    if (s->server) {
        sender = ssl->method->ssl3_enc->server_finished_label;
        slen = ssl->method->ssl3_enc->server_finished_label_len;
    } else {
        sender = ssl->method->ssl3_enc->client_finished_label;
        slen = ssl->method->ssl3_enc->client_finished_label_len;
    }

    finish_md_len = ssl->method->ssl3_enc->final_finish_mac(s,
                                                            sender, slen,
                                                            s->s3.tmp.finish_md);
    if (finish_md_len == 0) {
        
        return CON_FUNC_ERROR;
    }

    s->s3.tmp.finish_md_len = finish_md_len;

    if (!WPACKET_memcpy(pkt, s->s3.tmp.finish_md, finish_md_len)) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        return CON_FUNC_ERROR;
    }

    
    if (!SSL_CONNECTION_IS_TLS13(s)
        && !ssl_log_secret(s, MASTER_SECRET_LABEL, s->session->master_key,
                           s->session->master_key_length)) {
        
        return CON_FUNC_ERROR;
    }

    
    if (!ossl_assert(finish_md_len <= EVP_MAX_MD_SIZE)) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        return CON_FUNC_ERROR;
    }
    if (!s->server) {
        memcpy(s->s3.previous_client_finished, s->s3.tmp.finish_md,
               finish_md_len);
        s->s3.previous_client_finished_len = finish_md_len;
    } else {
        memcpy(s->s3.previous_server_finished, s->s3.tmp.finish_md,
               finish_md_len);
        s->s3.previous_server_finished_len = finish_md_len;
    }

    return CON_FUNC_SUCCESS;
}

CON_FUNC_RETURN tls_construct_key_update(SSL_CONNECTION *s, WPACKET *pkt)
{
    if (!WPACKET_put_bytes_u8(pkt, s->key_update)) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        return CON_FUNC_ERROR;
    }

    s->key_update = SSL_KEY_UPDATE_NONE;
    return CON_FUNC_SUCCESS;
}

MSG_PROCESS_RETURN tls_process_key_update(SSL_CONNECTION *s, PACKET *pkt)
{
    unsigned int updatetype;

    
    if (RECORD_LAYER_processed_read_pending(&s->rlayer)) {
        SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_R_NOT_ON_RECORD_BOUNDARY);
        return MSG_PROCESS_ERROR;
    }

    if (!PACKET_get_1(pkt, &updatetype)
            || PACKET_remaining(pkt) != 0) {
        SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_BAD_KEY_UPDATE);
        return MSG_PROCESS_ERROR;
    }

    
    if (updatetype != SSL_KEY_UPDATE_NOT_REQUESTED
            && updatetype != SSL_KEY_UPDATE_REQUESTED) {
        SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER, SSL_R_BAD_KEY_UPDATE);
        return MSG_PROCESS_ERROR;
    }

    
    if (updatetype == SSL_KEY_UPDATE_REQUESTED)
        s->key_update = SSL_KEY_UPDATE_NOT_REQUESTED;

    if (!tls13_update_key(s, 0)) {
        
        return MSG_PROCESS_ERROR;
    }

    return MSG_PROCESS_FINISHED_READING;
}


int ssl3_take_mac(SSL_CONNECTION *s)
{
    const char *sender;
    size_t slen;
    SSL *ssl = SSL_CONNECTION_GET_SSL(s);

    if (!s->server) {
        sender = ssl->method->ssl3_enc->server_finished_label;
        slen = ssl->method->ssl3_enc->server_finished_label_len;
    } else {
        sender = ssl->method->ssl3_enc->client_finished_label;
        slen = ssl->method->ssl3_enc->client_finished_label_len;
    }

    s->s3.tmp.peer_finish_md_len =
        ssl->method->ssl3_enc->final_finish_mac(s, sender, slen,
                                                s->s3.tmp.peer_finish_md);

    if (s->s3.tmp.peer_finish_md_len == 0) {
        
        return 0;
    }

    return 1;
}

MSG_PROCESS_RETURN tls_process_change_cipher_spec(SSL_CONNECTION *s,
                                                  PACKET *pkt)
{
    size_t remain;

    remain = PACKET_remaining(pkt);
    
    if (SSL_CONNECTION_IS_DTLS(s)) {
        if ((s->version == DTLS1_BAD_VER
             && remain != DTLS1_CCS_HEADER_LENGTH + 1)
            || (s->version != DTLS1_BAD_VER
                && remain != DTLS1_CCS_HEADER_LENGTH - 1)) {
            SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_BAD_CHANGE_CIPHER_SPEC);
            return MSG_PROCESS_ERROR;
        }
    } else {
        if (remain != 0) {
            SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_BAD_CHANGE_CIPHER_SPEC);
            return MSG_PROCESS_ERROR;
        }
    }

    
    if (s->s3.tmp.new_cipher == NULL) {
        SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_R_CCS_RECEIVED_EARLY);
        return MSG_PROCESS_ERROR;
    }

    s->s3.change_cipher_spec = 1;
    if (!ssl3_do_change_cipher_spec(s)) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        return MSG_PROCESS_ERROR;
    }

    if (SSL_CONNECTION_IS_DTLS(s)) {
        if (s->version == DTLS1_BAD_VER)
            s->d1->handshake_read_seq++;

#ifndef OPENSSL_NO_SCTP
        
        BIO_ctrl(SSL_get_wbio(SSL_CONNECTION_GET_SSL(s)),
                 BIO_CTRL_DGRAM_SCTP_AUTH_CCS_RCVD, 1, NULL);
#endif
    }

    return MSG_PROCESS_CONTINUE_READING;
}

MSG_PROCESS_RETURN tls_process_finished(SSL_CONNECTION *s, PACKET *pkt)
{
    size_t md_len;
    SSL *ssl = SSL_CONNECTION_GET_SSL(s);
    int was_first = SSL_IS_FIRST_HANDSHAKE(s);
    int ok;


    
    if (s->server) {
        
        if (s->rlayer.rrlmethod->set_plain_alerts != NULL)
            s->rlayer.rrlmethod->set_plain_alerts(s->rlayer.rrl, 0);
        if (s->post_handshake_auth != SSL_PHA_REQUESTED)
            s->statem.cleanuphand = 1;
        if (SSL_CONNECTION_IS_TLS13(s)
            && !tls13_save_handshake_digest_for_pha(s)) {
                
                return MSG_PROCESS_ERROR;
        }
    }

    
    if (SSL_CONNECTION_IS_TLS13(s)
        && RECORD_LAYER_processed_read_pending(&s->rlayer)) {
        SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_R_NOT_ON_RECORD_BOUNDARY);
        return MSG_PROCESS_ERROR;
    }

    
    if (!SSL_CONNECTION_IS_TLS13(s) && !s->s3.change_cipher_spec) {
        SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE, SSL_R_GOT_A_FIN_BEFORE_A_CCS);
        return MSG_PROCESS_ERROR;
    }
    s->s3.change_cipher_spec = 0;

    md_len = s->s3.tmp.peer_finish_md_len;

    if (md_len != PACKET_remaining(pkt)) {
        SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_BAD_DIGEST_LENGTH);
        return MSG_PROCESS_ERROR;
    }

    ok = CRYPTO_memcmp(PACKET_data(pkt), s->s3.tmp.peer_finish_md,
                       md_len);
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
    if (ok != 0) {
        if ((PACKET_data(pkt)[0] ^ s->s3.tmp.peer_finish_md[0]) != 0xFF) {
            ok = 0;
        }
    }
#endif
    if (ok != 0) {
        SSLfatal(s, SSL_AD_DECRYPT_ERROR, SSL_R_DIGEST_CHECK_FAILED);
        return MSG_PROCESS_ERROR;
    }

    
    if (!ossl_assert(md_len <= EVP_MAX_MD_SIZE)) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        return MSG_PROCESS_ERROR;
    }
    if (s->server) {
        memcpy(s->s3.previous_client_finished, s->s3.tmp.peer_finish_md,
               md_len);
        s->s3.previous_client_finished_len = md_len;
    } else {
        memcpy(s->s3.previous_server_finished, s->s3.tmp.peer_finish_md,
               md_len);
        s->s3.previous_server_finished_len = md_len;
    }

    
    if (SSL_CONNECTION_IS_TLS13(s)) {
        if (s->server) {
            if (s->post_handshake_auth != SSL_PHA_REQUESTED &&
                    !ssl->method->ssl3_enc->change_cipher_state(s,
                        SSL3_CC_APPLICATION | SSL3_CHANGE_CIPHER_SERVER_READ)) {
                
                return MSG_PROCESS_ERROR;
            }
        } else {
            
            size_t dummy;
            if (!ssl->method->ssl3_enc->generate_master_secret(s,
                    s->master_secret, s->handshake_secret, 0,
                    &dummy)) {
                
                return MSG_PROCESS_ERROR;
            }
            if (!ssl->method->ssl3_enc->change_cipher_state(s,
                    SSL3_CC_APPLICATION | SSL3_CHANGE_CIPHER_CLIENT_READ)) {
                
                return MSG_PROCESS_ERROR;
            }
            if (!tls_process_initial_server_flight(s)) {
                
                return MSG_PROCESS_ERROR;
            }
        }
    }

    if (was_first
            && !SSL_IS_FIRST_HANDSHAKE(s)
            && s->rlayer.rrlmethod->set_first_handshake != NULL)
        s->rlayer.rrlmethod->set_first_handshake(s->rlayer.rrl, 0);

    return MSG_PROCESS_FINISHED_READING;
}

CON_FUNC_RETURN tls_construct_change_cipher_spec(SSL_CONNECTION *s, WPACKET *pkt)
{
    if (!WPACKET_put_bytes_u8(pkt, SSL3_MT_CCS)) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        return CON_FUNC_ERROR;
    }

    return CON_FUNC_SUCCESS;
}


static int ssl_add_cert_to_wpacket(SSL_CONNECTION *s, WPACKET *pkt,
                                   X509 *x, int chain, int for_comp)
{
    int len;
    unsigned char *outbytes;
    int context = SSL_EXT_TLS1_3_CERTIFICATE;

    if (for_comp)
        context |= SSL_EXT_TLS1_3_CERTIFICATE_COMPRESSION;

    len = i2d_X509(x, NULL);
    if (len < 0) {
        if (!for_comp)
            SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_BUF_LIB);
        return 0;
    }
    if (!WPACKET_sub_allocate_bytes_u24(pkt, len, &outbytes)
            || i2d_X509(x, &outbytes) != len) {
        if (!for_comp)
            SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        return 0;
    }

    if ((SSL_CONNECTION_IS_TLS13(s) || for_comp)
            && !tls_construct_extensions(s, pkt, context, x, chain)) {
        
        return 0;
    }

    return 1;
}


static int ssl_add_cert_chain(SSL_CONNECTION *s, WPACKET *pkt, CERT_PKEY *cpk, int for_comp)
{
    int i, chain_count;
    X509 *x;
    STACK_OF(X509) *extra_certs;
    STACK_OF(X509) *chain = NULL;
    X509_STORE *chain_store;
    SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s);

    if (cpk == NULL || cpk->x509 == NULL)
        return 1;

    x = cpk->x509;

    
    if (cpk->chain != NULL)
        extra_certs = cpk->chain;
    else
        extra_certs = sctx->extra_certs;

    if ((s->mode & SSL_MODE_NO_AUTO_CHAIN) || extra_certs)
        chain_store = NULL;
    else if (s->cert->chain_store)
        chain_store = s->cert->chain_store;
    else
        chain_store = sctx->cert_store;

    if (chain_store != NULL) {
        X509_STORE_CTX *xs_ctx = X509_STORE_CTX_new_ex(sctx->libctx,
                                                       sctx->propq);

        if (xs_ctx == NULL) {
            if (!for_comp)
                SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_X509_LIB);
            return 0;
        }
        if (!X509_STORE_CTX_init(xs_ctx, chain_store, x, NULL)) {
            X509_STORE_CTX_free(xs_ctx);
            if (!for_comp)
                SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_X509_LIB);
            return 0;
        }
        
        (void)X509_verify_cert(xs_ctx);
        
        ERR_clear_error();
        chain = X509_STORE_CTX_get0_chain(xs_ctx);
        i = ssl_security_cert_chain(s, chain, NULL, 0);
        if (i != 1) {
#if 0
            
            ERR_raise(ERR_LIB_SSL, SSL_R_EE_KEY_TOO_SMALL);
            ERR_raise(ERR_LIB_SSL, SSL_R_CA_KEY_TOO_SMALL);
            ERR_raise(ERR_LIB_SSL, SSL_R_CA_MD_TOO_WEAK);
#endif
            X509_STORE_CTX_free(xs_ctx);
            if (!for_comp)
                SSLfatal(s, SSL_AD_INTERNAL_ERROR, i);
            return 0;
        }
        chain_count = sk_X509_num(chain);
        for (i = 0; i < chain_count; i++) {
            x = sk_X509_value(chain, i);

            if (!ssl_add_cert_to_wpacket(s, pkt, x, i, for_comp)) {
                
                X509_STORE_CTX_free(xs_ctx);
                return 0;
            }
        }
        X509_STORE_CTX_free(xs_ctx);
    } else {
        i = ssl_security_cert_chain(s, extra_certs, x, 0);
        if (i != 1) {
            if (!for_comp)
                SSLfatal(s, SSL_AD_INTERNAL_ERROR, i);
            return 0;
        }
        if (!ssl_add_cert_to_wpacket(s, pkt, x, 0, for_comp)) {
            
            return 0;
        }
        for (i = 0; i < sk_X509_num(extra_certs); i++) {
            x = sk_X509_value(extra_certs, i);
            if (!ssl_add_cert_to_wpacket(s, pkt, x, i + 1, for_comp)) {
                
                return 0;
            }
        }
    }
    return 1;
}

EVP_PKEY* tls_get_peer_pkey(const SSL_CONNECTION *sc)
{
    if (sc->session->peer_rpk != NULL)
        return sc->session->peer_rpk;
    if (sc->session->peer != NULL)
        return X509_get0_pubkey(sc->session->peer);
    return NULL;
}

int tls_process_rpk(SSL_CONNECTION *sc, PACKET *pkt, EVP_PKEY **peer_rpk)
{
    EVP_PKEY *pkey = NULL;
    int ret = 0;
    RAW_EXTENSION *rawexts = NULL;
    PACKET extensions;
    PACKET context;
    unsigned long cert_len = 0, spki_len = 0;
    const unsigned char *spki, *spkistart;
    SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(sc);

    
    if (SSL_CONNECTION_IS_TLS13(sc)) {
        if (!PACKET_get_length_prefixed_1(pkt, &context)) {
            SSLfatal(sc, SSL_AD_DECODE_ERROR, SSL_R_INVALID_CONTEXT);
            goto err;
        }
        if (sc->server) {
            if (sc->pha_context == NULL) {
                if (PACKET_remaining(&context) != 0) {
                    SSLfatal(sc, SSL_AD_DECODE_ERROR, SSL_R_INVALID_CONTEXT);
                    goto err;
                }
            } else {
                if (!PACKET_equal(&context, sc->pha_context, sc->pha_context_len)) {
                    SSLfatal(sc, SSL_AD_DECODE_ERROR, SSL_R_INVALID_CONTEXT);
                    goto err;
                }
            }
        } else {
            if (PACKET_remaining(&context) != 0) {
                SSLfatal(sc, SSL_AD_DECODE_ERROR, SSL_R_INVALID_CONTEXT);
                goto err;
            }
        }
    }

    if (!PACKET_get_net_3(pkt, &cert_len)
        || PACKET_remaining(pkt) != cert_len) {
        SSLfatal(sc, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
        goto err;
    }

    
    if (cert_len == 0)
        return 1;

    if (SSL_CONNECTION_IS_TLS13(sc)) {
        
        if (!PACKET_get_net_3(pkt, &spki_len)) {
            SSLfatal(sc, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
            goto err;
        }
        if (spki_len == 0) {
            
            SSLfatal(sc, SSL_AD_DECODE_ERROR, SSL_R_EMPTY_RAW_PUBLIC_KEY);
            goto err;
        }
    } else {
        spki_len = cert_len;
    }

    if (!PACKET_get_bytes(pkt, &spki, spki_len)) {
        SSLfatal(sc, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
        goto err;
    }
    spkistart = spki;
    if ((pkey = d2i_PUBKEY_ex(NULL, &spki, spki_len, sctx->libctx, sctx->propq)) == NULL
            || spki != (spkistart + spki_len)) {
        SSLfatal(sc, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
        goto err;
    }
    if (EVP_PKEY_missing_parameters(pkey)) {
        SSLfatal(sc, SSL_AD_INTERNAL_ERROR,
                 SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
        goto err;
    }

    
    if (SSL_CONNECTION_IS_TLS13(sc)) {
        if (PACKET_remaining(pkt) != (cert_len - 3 - spki_len)) {
            SSLfatal(sc, SSL_AD_DECODE_ERROR, SSL_R_BAD_LENGTH);
            goto err;
        }
        if (!PACKET_as_length_prefixed_2(pkt, &extensions)
                || PACKET_remaining(pkt) != 0) {
            SSLfatal(sc, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
            goto err;
        }
        if (!tls_collect_extensions(sc, &extensions, SSL_EXT_TLS1_3_RAW_PUBLIC_KEY,
                                    &rawexts, NULL, 1)) {
            
            goto err;
        }
        
        if (!tls_parse_all_extensions(sc, SSL_EXT_TLS1_3_RAW_PUBLIC_KEY,
                                      rawexts, NULL, 0, 1)) {
            
            goto err;
        }
    }
    ret = 1;
    if (peer_rpk != NULL) {
        *peer_rpk = pkey;
        pkey = NULL;
    }

 err:
    OPENSSL_free(rawexts);
    EVP_PKEY_free(pkey);
    return ret;
}

unsigned long tls_output_rpk(SSL_CONNECTION *sc, WPACKET *pkt, CERT_PKEY *cpk)
{
    int pdata_len = 0;
    unsigned char *pdata = NULL;
    X509_PUBKEY *xpk = NULL;
    unsigned long ret = 0;
    X509 *x509 = NULL;

    if (cpk != NULL && cpk->x509 != NULL) {
        x509 = cpk->x509;
        
        xpk = X509_get_X509_PUBKEY(cpk->x509);
        if (xpk == NULL) {
            SSLfatal(sc, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
            goto err;
        }
        pdata_len = i2d_X509_PUBKEY(xpk, &pdata);
    } else if (cpk != NULL && cpk->privatekey != NULL) {
        
        pdata_len = i2d_PUBKEY(cpk->privatekey, &pdata);
    } else {
        
        if (sc->server) {
            SSLfatal(sc, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
            goto err;
        }
        
        if (!WPACKET_sub_memcpy_u24(pkt, pdata, pdata_len)) {
            SSLfatal(sc, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
            goto err;
        }
        return 1;
    }

    if (pdata_len <= 0) {
        SSLfatal(sc, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        goto err;
    }

    
    if (SSL_CONNECTION_IS_TLS13(sc)) {
        if (!WPACKET_start_sub_packet_u24(pkt)) {
            SSLfatal(sc, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
            goto err;
        }
    }

    if (!WPACKET_sub_memcpy_u24(pkt, pdata, pdata_len)) {
        SSLfatal(sc, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        goto err;
    }

    if (SSL_CONNECTION_IS_TLS13(sc)) {
        
        if (!tls_construct_extensions(sc, pkt, SSL_EXT_TLS1_3_RAW_PUBLIC_KEY,
                                      x509, 0)) {
            
            goto err;
        }
        if (!WPACKET_close(pkt)) {
            SSLfatal(sc, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
            goto err;
        }
    }

    ret = 1;
 err:
    OPENSSL_free(pdata);
    return ret;
}

unsigned long ssl3_output_cert_chain(SSL_CONNECTION *s, WPACKET *pkt,
                                     CERT_PKEY *cpk, int for_comp)
{
    if (!WPACKET_start_sub_packet_u24(pkt)) {
        if (!for_comp)
            SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        return 0;
    }

    if (!ssl_add_cert_chain(s, pkt, cpk, for_comp))
        return 0;

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

    return 1;
}


WORK_STATE tls_finish_handshake(SSL_CONNECTION *s, ossl_unused WORK_STATE wst,
                                int clearbufs, int stop)
{
    void (*cb) (const SSL *ssl, int type, int val) = NULL;
    int cleanuphand = s->statem.cleanuphand;
    SSL *ssl = SSL_CONNECTION_GET_SSL(s);
    SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s);

    if (clearbufs) {
        if (!SSL_CONNECTION_IS_DTLS(s)
#ifndef OPENSSL_NO_SCTP
            
            || BIO_dgram_is_sctp(SSL_get_wbio(ssl))
#endif
            ) {
            
            BUF_MEM_free(s->init_buf);
            s->init_buf = NULL;
        }

        if (!ssl_free_wbio_buffer(s)) {
            SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
            return WORK_ERROR;
        }
        s->init_num = 0;
    }

    if (SSL_CONNECTION_IS_TLS13(s) && !s->server
            && s->post_handshake_auth == SSL_PHA_REQUESTED)
        s->post_handshake_auth = SSL_PHA_EXT_SENT;

    
    if (cleanuphand) {
        
        s->renegotiate = 0;
        s->new_session = 0;
        s->statem.cleanuphand = 0;
        s->ext.ticket_expected = 0;

        ssl3_cleanup_key_block(s);

        if (s->server) {
            
            if (!SSL_CONNECTION_IS_TLS13(s))
                ssl_update_cache(s, SSL_SESS_CACHE_SERVER);

            
            ssl_tsan_counter(sctx, &sctx->stats.sess_accept_good);
            s->handshake_func = ossl_statem_accept;
        } else {
            if (SSL_CONNECTION_IS_TLS13(s)) {
                
                if ((s->session_ctx->session_cache_mode
                     & SSL_SESS_CACHE_CLIENT) != 0)
                    SSL_CTX_remove_session(s->session_ctx, s->session);
            } else {
                
                ssl_update_cache(s, SSL_SESS_CACHE_CLIENT);
            }
            if (s->hit)
                ssl_tsan_counter(s->session_ctx,
                                 &s->session_ctx->stats.sess_hit);

            s->handshake_func = ossl_statem_connect;
            ssl_tsan_counter(s->session_ctx,
                             &s->session_ctx->stats.sess_connect_good);
        }

        if (SSL_CONNECTION_IS_DTLS(s)) {
            
            s->d1->handshake_read_seq = 0;
            s->d1->handshake_write_seq = 0;
            s->d1->next_handshake_write_seq = 0;
            dtls1_clear_received_buffer(s);
        }
    }

    if (s->info_callback != NULL)
        cb = s->info_callback;
    else if (sctx->info_callback != NULL)
        cb = sctx->info_callback;

    
    ossl_statem_set_in_init(s, 0);

    if (cb != NULL) {
        if (cleanuphand
                || !SSL_CONNECTION_IS_TLS13(s)
                || SSL_IS_FIRST_HANDSHAKE(s))
            cb(ssl, SSL_CB_HANDSHAKE_DONE, 1);
    }

    if (!stop) {
        
        ossl_statem_set_in_init(s, 1);
        return WORK_FINISHED_CONTINUE;
    }

    return WORK_FINISHED_STOP;
}

int tls_get_message_header(SSL_CONNECTION *s, int *mt)
{
    
    int skip_message, i;
    uint8_t recvd_type;
    unsigned char *p;
    size_t l, readbytes;
    SSL *ssl = SSL_CONNECTION_GET_SSL(s);

    p = (unsigned char *)s->init_buf->data;

    do {
        while (s->init_num < SSL3_HM_HEADER_LENGTH) {
            i = ssl->method->ssl_read_bytes(ssl, SSL3_RT_HANDSHAKE, &recvd_type,
                                            &p[s->init_num],
                                            SSL3_HM_HEADER_LENGTH - s->init_num,
                                            0, &readbytes);
            if (i <= 0) {
                s->rwstate = SSL_READING;
                return 0;
            }
            if (recvd_type == SSL3_RT_CHANGE_CIPHER_SPEC) {
                
                if (s->init_num != 0 || readbytes != 1 || p[0] != SSL3_MT_CCS) {
                    SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE,
                             SSL_R_BAD_CHANGE_CIPHER_SPEC);
                    return 0;
                }
                if (s->statem.hand_state == TLS_ST_BEFORE
                        && (s->s3.flags & TLS1_FLAGS_STATELESS) != 0) {
                    
                    return 0;
                }
                s->s3.tmp.message_type = *mt = SSL3_MT_CHANGE_CIPHER_SPEC;
                s->init_num = readbytes - 1;
                s->init_msg = s->init_buf->data;
                s->s3.tmp.message_size = readbytes;
                return 1;
            } else if (recvd_type != SSL3_RT_HANDSHAKE) {
                SSLfatal(s, SSL_AD_UNEXPECTED_MESSAGE,
                         SSL_R_CCS_RECEIVED_EARLY);
                return 0;
            }
            s->init_num += readbytes;
        }

        skip_message = 0;
        if (!s->server)
            if (s->statem.hand_state != TLS_ST_OK
                    && p[0] == SSL3_MT_HELLO_REQUEST)
                
                if (p[1] == 0 && p[2] == 0 && p[3] == 0) {
                    s->init_num = 0;
                    skip_message = 1;

                    if (s->msg_callback)
                        s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE,
                                        p, SSL3_HM_HEADER_LENGTH, ssl,
                                        s->msg_callback_arg);
                }
    } while (skip_message);
    

    *mt = *p;
    s->s3.tmp.message_type = *(p++);

    if (RECORD_LAYER_is_sslv2_record(&s->rlayer)) {
        
        l = s->rlayer.tlsrecs[0].length + SSL3_HM_HEADER_LENGTH;
        s->s3.tmp.message_size = l;

        s->init_msg = s->init_buf->data;
        s->init_num = SSL3_HM_HEADER_LENGTH;
    } else {
        n2l3(p, l);
        
        if (l > (INT_MAX - SSL3_HM_HEADER_LENGTH)) {
            SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
                     SSL_R_EXCESSIVE_MESSAGE_SIZE);
            return 0;
        }
        s->s3.tmp.message_size = l;

        s->init_msg = s->init_buf->data + SSL3_HM_HEADER_LENGTH;
        s->init_num = 0;
    }

    return 1;
}

int tls_get_message_body(SSL_CONNECTION *s, size_t *len)
{
    size_t n, readbytes;
    unsigned char *p;
    int i;
    SSL *ssl = SSL_CONNECTION_GET_SSL(s);

    if (s->s3.tmp.message_type == SSL3_MT_CHANGE_CIPHER_SPEC) {
        
        *len = (unsigned long)s->init_num;
        return 1;
    }

    p = s->init_msg;
    n = s->s3.tmp.message_size - s->init_num;
    while (n > 0) {
        i = ssl->method->ssl_read_bytes(ssl, SSL3_RT_HANDSHAKE, NULL,
                                        &p[s->init_num], n, 0, &readbytes);
        if (i <= 0) {
            s->rwstate = SSL_READING;
            *len = 0;
            return 0;
        }
        s->init_num += readbytes;
        n -= readbytes;
    }

    
    if (*(s->init_buf->data) == SSL3_MT_FINISHED && !ssl3_take_mac(s)) {
        
        *len = 0;
        return 0;
    }

    
    if (RECORD_LAYER_is_sslv2_record(&s->rlayer)) {
        if (!ssl3_finish_mac(s, (unsigned char *)s->init_buf->data,
                             s->init_num)) {
            
            *len = 0;
            return 0;
        }
        if (s->msg_callback)
            s->msg_callback(0, SSL2_VERSION, 0, s->init_buf->data,
                            (size_t)s->init_num, ssl, s->msg_callback_arg);
    } else {
        
#define SERVER_HELLO_RANDOM_OFFSET  (SSL3_HM_HEADER_LENGTH + 2)
        
        if (!SSL_CONNECTION_IS_TLS13(s)
            || (s->s3.tmp.message_type != SSL3_MT_NEWSESSION_TICKET
                         && s->s3.tmp.message_type != SSL3_MT_KEY_UPDATE)) {
            if (s->s3.tmp.message_type != SSL3_MT_SERVER_HELLO
                    || s->init_num < SERVER_HELLO_RANDOM_OFFSET + SSL3_RANDOM_SIZE
                    || memcmp(hrrrandom,
                              s->init_buf->data + SERVER_HELLO_RANDOM_OFFSET,
                              SSL3_RANDOM_SIZE) != 0) {
                if (!ssl3_finish_mac(s, (unsigned char *)s->init_buf->data,
                                     s->init_num + SSL3_HM_HEADER_LENGTH)) {
                    
                    *len = 0;
                    return 0;
                }
            }
        }
        if (s->msg_callback)
            s->msg_callback(0, s->version, SSL3_RT_HANDSHAKE, s->init_buf->data,
                            (size_t)s->init_num + SSL3_HM_HEADER_LENGTH, ssl,
                            s->msg_callback_arg);
    }

    *len = s->init_num;
    return 1;
}

static const X509ERR2ALERT x509table[] = {
    {X509_V_ERR_APPLICATION_VERIFICATION, SSL_AD_HANDSHAKE_FAILURE},
    {X509_V_ERR_CA_KEY_TOO_SMALL, SSL_AD_BAD_CERTIFICATE},
    {X509_V_ERR_EC_KEY_EXPLICIT_PARAMS, SSL_AD_BAD_CERTIFICATE},
    {X509_V_ERR_CA_MD_TOO_WEAK, SSL_AD_BAD_CERTIFICATE},
    {X509_V_ERR_CERT_CHAIN_TOO_LONG, SSL_AD_UNKNOWN_CA},
    {X509_V_ERR_CERT_HAS_EXPIRED, SSL_AD_CERTIFICATE_EXPIRED},
    {X509_V_ERR_CERT_NOT_YET_VALID, SSL_AD_BAD_CERTIFICATE},
    {X509_V_ERR_CERT_REJECTED, SSL_AD_BAD_CERTIFICATE},
    {X509_V_ERR_CERT_REVOKED, SSL_AD_CERTIFICATE_REVOKED},
    {X509_V_ERR_CERT_SIGNATURE_FAILURE, SSL_AD_DECRYPT_ERROR},
    {X509_V_ERR_CERT_UNTRUSTED, SSL_AD_BAD_CERTIFICATE},
    {X509_V_ERR_CRL_HAS_EXPIRED, SSL_AD_CERTIFICATE_EXPIRED},
    {X509_V_ERR_CRL_NOT_YET_VALID, SSL_AD_BAD_CERTIFICATE},
    {X509_V_ERR_CRL_SIGNATURE_FAILURE, SSL_AD_DECRYPT_ERROR},
    {X509_V_ERR_DANE_NO_MATCH, SSL_AD_BAD_CERTIFICATE},
    {X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT, SSL_AD_UNKNOWN_CA},
    {X509_V_ERR_EE_KEY_TOO_SMALL, SSL_AD_BAD_CERTIFICATE},
    {X509_V_ERR_EMAIL_MISMATCH, SSL_AD_BAD_CERTIFICATE},
    {X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD, SSL_AD_BAD_CERTIFICATE},
    {X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD, SSL_AD_BAD_CERTIFICATE},
    {X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD, SSL_AD_BAD_CERTIFICATE},
    {X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD, SSL_AD_BAD_CERTIFICATE},
    {X509_V_ERR_HOSTNAME_MISMATCH, SSL_AD_BAD_CERTIFICATE},
    {X509_V_ERR_INVALID_CA, SSL_AD_UNKNOWN_CA},
    {X509_V_ERR_INVALID_CALL, SSL_AD_INTERNAL_ERROR},
    {X509_V_ERR_INVALID_PURPOSE, SSL_AD_UNSUPPORTED_CERTIFICATE},
    {X509_V_ERR_IP_ADDRESS_MISMATCH, SSL_AD_BAD_CERTIFICATE},
    {X509_V_ERR_OUT_OF_MEM, SSL_AD_INTERNAL_ERROR},
    {X509_V_ERR_PATH_LENGTH_EXCEEDED, SSL_AD_UNKNOWN_CA},
    {X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN, SSL_AD_UNKNOWN_CA},
    {X509_V_ERR_STORE_LOOKUP, SSL_AD_INTERNAL_ERROR},
    {X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY, SSL_AD_BAD_CERTIFICATE},
    {X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE, SSL_AD_BAD_CERTIFICATE},
    {X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE, SSL_AD_BAD_CERTIFICATE},
    {X509_V_ERR_UNABLE_TO_GET_CRL, SSL_AD_UNKNOWN_CA},
    {X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER, SSL_AD_UNKNOWN_CA},
    {X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT, SSL_AD_UNKNOWN_CA},
    {X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY, SSL_AD_UNKNOWN_CA},
    {X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE, SSL_AD_UNKNOWN_CA},
    {X509_V_ERR_UNSPECIFIED, SSL_AD_INTERNAL_ERROR},

    
    {X509_V_OK, SSL_AD_CERTIFICATE_UNKNOWN}
};

int ssl_x509err2alert(int x509err)
{
    const X509ERR2ALERT *tp;

    for (tp = x509table; tp->x509err != X509_V_OK; ++tp)
        if (tp->x509err == x509err)
            break;
    return tp->alert;
}

int ssl_allow_compression(SSL_CONNECTION *s)
{
    if (s->options & SSL_OP_NO_COMPRESSION)
        return 0;
    return ssl_security(s, SSL_SECOP_COMPRESSION, 0, 0, NULL);
}


int ssl_version_cmp(const SSL_CONNECTION *s, int versiona, int versionb)
{
    int dtls = SSL_CONNECTION_IS_DTLS(s);

    if (versiona == versionb)
        return 0;
    if (!dtls)
        return versiona < versionb ? -1 : 1;
    return DTLS_VERSION_LT(versiona, versionb) ? -1 : 1;
}

typedef struct {
    int version;
    const SSL_METHOD *(*cmeth) (void);
    const SSL_METHOD *(*smeth) (void);
} version_info;

#if TLS_MAX_VERSION_INTERNAL != TLS1_3_VERSION
# error Code needs update for TLS_method() support beyond TLS1_3_VERSION.
#endif


static const version_info tls_version_table[] = {
#ifndef OPENSSL_NO_TLS1_3
    {TLS1_3_VERSION, tlsv1_3_client_method, tlsv1_3_server_method},
#else
    {TLS1_3_VERSION, NULL, NULL},
#endif
#ifndef OPENSSL_NO_TLS1_2
    {TLS1_2_VERSION, tlsv1_2_client_method, tlsv1_2_server_method},
#else
    {TLS1_2_VERSION, NULL, NULL},
#endif
#ifndef OPENSSL_NO_TLS1_1
    {TLS1_1_VERSION, tlsv1_1_client_method, tlsv1_1_server_method},
#else
    {TLS1_1_VERSION, NULL, NULL},
#endif
#ifndef OPENSSL_NO_TLS1
    {TLS1_VERSION, tlsv1_client_method, tlsv1_server_method},
#else
    {TLS1_VERSION, NULL, NULL},
#endif
#ifndef OPENSSL_NO_SSL3
    {SSL3_VERSION, sslv3_client_method, sslv3_server_method},
#else
    {SSL3_VERSION, NULL, NULL},
#endif
    {0, NULL, NULL},
};

#if DTLS_MAX_VERSION_INTERNAL != DTLS1_2_VERSION
# error Code needs update for DTLS_method() support beyond DTLS1_2_VERSION.
#endif


static const version_info dtls_version_table[] = {
#ifndef OPENSSL_NO_DTLS1_2
    {DTLS1_2_VERSION, dtlsv1_2_client_method, dtlsv1_2_server_method},
#else
    {DTLS1_2_VERSION, NULL, NULL},
#endif
#ifndef OPENSSL_NO_DTLS1
    {DTLS1_VERSION, dtlsv1_client_method, dtlsv1_server_method},
    {DTLS1_BAD_VER, dtls_bad_ver_client_method, NULL},
#else
    {DTLS1_VERSION, NULL, NULL},
    {DTLS1_BAD_VER, NULL, NULL},
#endif
    {0, NULL, NULL},
};


static int ssl_method_error(const SSL_CONNECTION *s, const SSL_METHOD *method)
{
    int version = method->version;

    if ((s->min_proto_version != 0 &&
        ssl_version_cmp(s, version, s->min_proto_version) < 0) ||
        ssl_security(s, SSL_SECOP_VERSION, 0, version, NULL) == 0)
        return SSL_R_VERSION_TOO_LOW;

    if (s->max_proto_version != 0 &&
        ssl_version_cmp(s, version, s->max_proto_version) > 0)
        return SSL_R_VERSION_TOO_HIGH;

    if ((s->options & method->mask) != 0)
        return SSL_R_UNSUPPORTED_PROTOCOL;
    if ((method->flags & SSL_METHOD_NO_SUITEB) != 0 && tls1_suiteb(s))
        return SSL_R_AT_LEAST_TLS_1_2_NEEDED_IN_SUITEB_MODE;

    return 0;
}


static int is_tls13_capable(const SSL_CONNECTION *s)
{
    size_t i;
    int curve;
    SSL_CTX *sctx = SSL_CONNECTION_GET_CTX(s);

    if (!ossl_assert(sctx != NULL) || !ossl_assert(s->session_ctx != NULL))
        return 0;

    
    if (sctx->ext.servername_cb != NULL
            || s->session_ctx->ext.servername_cb != NULL)
        return 1;

#ifndef OPENSSL_NO_PSK
    if (s->psk_server_callback != NULL)
        return 1;
#endif

    if (s->psk_find_session_cb != NULL || s->cert->cert_cb != NULL)
        return 1;

    
    for (i = 0; i < s->ssl_pkey_num; i++) {
        
        switch (i) {
        case SSL_PKEY_DSA_SIGN:
        case SSL_PKEY_GOST01:
        case SSL_PKEY_GOST12_256:
        case SSL_PKEY_GOST12_512:
            continue;
        default:
            break;
        }
        if (!ssl_has_cert(s, i))
            continue;
        if (i != SSL_PKEY_ECC)
            return 1;
        
        curve = ssl_get_EC_curve_nid(s->cert->pkeys[SSL_PKEY_ECC].privatekey);
        if (tls_check_sigalg_curve(s, curve))
            return 1;
    }

    return 0;
}


int ssl_version_supported(const SSL_CONNECTION *s, int version,
                          const SSL_METHOD **meth)
{
    const version_info *vent;
    const version_info *table;

    switch (SSL_CONNECTION_GET_SSL(s)->method->version) {
    default:
        
        return ssl_version_cmp(s, version, s->version) == 0;
    case TLS_ANY_VERSION:
        table = tls_version_table;
        break;
    case DTLS_ANY_VERSION:
        table = dtls_version_table;
        break;
    }

    for (vent = table;
         vent->version != 0 && ssl_version_cmp(s, version, vent->version) <= 0;
         ++vent) {
        const SSL_METHOD *(*thismeth)(void) = s->server ? vent->smeth
                                                        : vent->cmeth;

        if (thismeth != NULL
                && ssl_version_cmp(s, version, vent->version) == 0
                && ssl_method_error(s, thismeth()) == 0
                && (!s->server
                    || version != TLS1_3_VERSION
                    || is_tls13_capable(s))) {
            if (meth != NULL)
                *meth = thismeth();
            return 1;
        }
    }
    return 0;
}


int ssl_check_version_downgrade(SSL_CONNECTION *s)
{
    const version_info *vent;
    const version_info *table;
    SSL *ssl = SSL_CONNECTION_GET_SSL(s);

    
    if (s->version == ssl->defltmeth->version)
        return 1;

    
    if (ssl->defltmeth->version == TLS_method()->version)
        table = tls_version_table;
    else if (ssl->defltmeth->version == DTLS_method()->version)
        table = dtls_version_table;
    else {
        
        return 0;
    }

    for (vent = table; vent->version != 0; ++vent) {
        if (vent->smeth != NULL && ssl_method_error(s, vent->smeth()) == 0)
            return s->version == vent->version;
    }
    return 0;
}


int ssl_set_version_bound(int method_version, int version, int *bound)
{
    int valid_tls;
    int valid_dtls;

    if (version == 0) {
        *bound = version;
        return 1;
    }

    valid_tls = version >= SSL3_VERSION && version <= TLS_MAX_VERSION_INTERNAL;
    valid_dtls =
        
        (version == DTLS1_BAD_VER)
        || (DTLS_VERSION_LE(version, DTLS_MAX_VERSION_INTERNAL)
            && DTLS_VERSION_GE(version, DTLS1_VERSION));

    if (!valid_tls && !valid_dtls)
        return 0;

    
    switch (method_version) {
    default:
        break;

    case TLS_ANY_VERSION:
        if (valid_tls)
            *bound = version;
        break;

    case DTLS_ANY_VERSION:
        if (valid_dtls)
            *bound = version;
        break;
    }
    return 1;
}

static void check_for_downgrade(SSL_CONNECTION *s, int vers, DOWNGRADE *dgrd)
{
    if (vers == TLS1_2_VERSION
            && ssl_version_supported(s, TLS1_3_VERSION, NULL)) {
        *dgrd = DOWNGRADE_TO_1_2;
    } else if (!SSL_CONNECTION_IS_DTLS(s)
            && vers < TLS1_2_VERSION
               
            && ssl_version_supported(s, TLS1_2_VERSION, NULL)) {
        *dgrd = DOWNGRADE_TO_1_1;
    } else {
        *dgrd = DOWNGRADE_NONE;
    }
}


int ssl_choose_server_version(SSL_CONNECTION *s, CLIENTHELLO_MSG *hello,
                              DOWNGRADE *dgrd)
{
    
    SSL *ssl = SSL_CONNECTION_GET_SSL(s);
    int server_version = ssl->method->version;
    int client_version = hello->legacy_version;
    const version_info *vent;
    const version_info *table;
    int disabled = 0;
    RAW_EXTENSION *suppversions;

    s->client_version = client_version;

    switch (server_version) {
    default:
        if (!SSL_CONNECTION_IS_TLS13(s)) {
            if (ssl_version_cmp(s, client_version, s->version) < 0)
                return SSL_R_WRONG_SSL_VERSION;
            *dgrd = DOWNGRADE_NONE;
            
            return 0;
        }
        
        
    case TLS_ANY_VERSION:
        table = tls_version_table;
        break;
    case DTLS_ANY_VERSION:
        table = dtls_version_table;
        break;
    }

    suppversions = &hello->pre_proc_exts[TLSEXT_IDX_supported_versions];

    
    if (!suppversions->present && s->hello_retry_request != SSL_HRR_NONE)
        return SSL_R_UNSUPPORTED_PROTOCOL;

    if (suppversions->present && !SSL_CONNECTION_IS_DTLS(s)) {
        unsigned int candidate_vers = 0;
        unsigned int best_vers = 0;
        const SSL_METHOD *best_method = NULL;
        PACKET versionslist;

        suppversions->parsed = 1;

        if (!PACKET_as_length_prefixed_1(&suppversions->data, &versionslist)) {
            
            return SSL_R_LENGTH_MISMATCH;
        }

        
        if (client_version <= SSL3_VERSION)
            return SSL_R_BAD_LEGACY_VERSION;

        while (PACKET_get_net_2(&versionslist, &candidate_vers)) {
            if (ssl_version_cmp(s, candidate_vers, best_vers) <= 0)
                continue;
            if (ssl_version_supported(s, candidate_vers, &best_method))
                best_vers = candidate_vers;
        }
        if (PACKET_remaining(&versionslist) != 0) {
            
            return SSL_R_LENGTH_MISMATCH;
        }

        if (best_vers > 0) {
            if (s->hello_retry_request != SSL_HRR_NONE) {
                
                if (best_vers != TLS1_3_VERSION)
                    return SSL_R_UNSUPPORTED_PROTOCOL;
                return 0;
            }
            check_for_downgrade(s, best_vers, dgrd);
            s->version = best_vers;
            ssl->method = best_method;
            if (!ssl_set_record_protocol_version(s, best_vers))
                return ERR_R_INTERNAL_ERROR;

            return 0;
        }
        return SSL_R_UNSUPPORTED_PROTOCOL;
    }

    
    if (ssl_version_cmp(s, client_version, TLS1_3_VERSION) >= 0)
        client_version = TLS1_2_VERSION;

    
    for (vent = table; vent->version != 0; ++vent) {
        const SSL_METHOD *method;

        if (vent->smeth == NULL ||
            ssl_version_cmp(s, client_version, vent->version) < 0)
            continue;
        method = vent->smeth();
        if (ssl_method_error(s, method) == 0) {
            check_for_downgrade(s, vent->version, dgrd);
            s->version = vent->version;
            ssl->method = method;
            if (!ssl_set_record_protocol_version(s, s->version))
                return ERR_R_INTERNAL_ERROR;

            return 0;
        }
        disabled = 1;
    }
    return disabled ? SSL_R_UNSUPPORTED_PROTOCOL : SSL_R_VERSION_TOO_LOW;
}


int ssl_choose_client_version(SSL_CONNECTION *s, int version,
                              RAW_EXTENSION *extensions)
{
    const version_info *vent;
    const version_info *table;
    int ret, ver_min, ver_max, real_max, origv;
    SSL *ssl = SSL_CONNECTION_GET_SSL(s);

    origv = s->version;
    s->version = version;

    
    if (!tls_parse_extension(s, TLSEXT_IDX_supported_versions,
                             SSL_EXT_TLS1_2_SERVER_HELLO
                             | SSL_EXT_TLS1_3_SERVER_HELLO, extensions,
                             NULL, 0)) {
        s->version = origv;
        return 0;
    }

    if (s->hello_retry_request != SSL_HRR_NONE
            && s->version != TLS1_3_VERSION) {
        s->version = origv;
        SSLfatal(s, SSL_AD_PROTOCOL_VERSION, SSL_R_WRONG_SSL_VERSION);
        return 0;
    }

    switch (ssl->method->version) {
    default:
        if (s->version != ssl->method->version) {
            s->version = origv;
            SSLfatal(s, SSL_AD_PROTOCOL_VERSION, SSL_R_WRONG_SSL_VERSION);
            return 0;
        }
        
        if (!ssl_set_record_protocol_version(s, s->version)) {
            SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
            return 0;
        }
        return 1;
    case TLS_ANY_VERSION:
        table = tls_version_table;
        break;
    case DTLS_ANY_VERSION:
        table = dtls_version_table;
        break;
    }

    ret = ssl_get_min_max_version(s, &ver_min, &ver_max, &real_max);
    if (ret != 0) {
        s->version = origv;
        SSLfatal(s, SSL_AD_PROTOCOL_VERSION, ret);
        return 0;
    }
    if (ssl_version_cmp(s, s->version, ver_min) < 0
        || ssl_version_cmp(s, s->version, ver_max) > 0) {
        s->version = origv;
        SSLfatal(s, SSL_AD_PROTOCOL_VERSION, SSL_R_UNSUPPORTED_PROTOCOL);
        return 0;
    }

    if ((s->mode & SSL_MODE_SEND_FALLBACK_SCSV) == 0)
        real_max = ver_max;

    
    if (s->version == TLS1_2_VERSION && real_max > s->version) {
        if (memcmp(tls12downgrade,
                   s->s3.server_random + SSL3_RANDOM_SIZE
                                        - sizeof(tls12downgrade),
                   sizeof(tls12downgrade)) == 0) {
            s->version = origv;
            SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
                     SSL_R_INAPPROPRIATE_FALLBACK);
            return 0;
        }
    } else if (!SSL_CONNECTION_IS_DTLS(s)
               && s->version < TLS1_2_VERSION
               && real_max > s->version) {
        if (memcmp(tls11downgrade,
                   s->s3.server_random + SSL3_RANDOM_SIZE
                                        - sizeof(tls11downgrade),
                   sizeof(tls11downgrade)) == 0) {
            s->version = origv;
            SSLfatal(s, SSL_AD_ILLEGAL_PARAMETER,
                     SSL_R_INAPPROPRIATE_FALLBACK);
            return 0;
        }
    }

    for (vent = table; vent->version != 0; ++vent) {
        if (vent->cmeth == NULL || s->version != vent->version)
            continue;

        ssl->method = vent->cmeth();
        if (!ssl_set_record_protocol_version(s, s->version)) {
            SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
            return 0;
        }
        return 1;
    }

    s->version = origv;
    SSLfatal(s, SSL_AD_PROTOCOL_VERSION, SSL_R_UNSUPPORTED_PROTOCOL);
    return 0;
}


int ssl_get_min_max_version(const SSL_CONNECTION *s, int *min_version,
                            int *max_version, int *real_max)
{
    int version, tmp_real_max;
    int hole;
    const SSL_METHOD *method;
    const version_info *table;
    const version_info *vent;
    const SSL *ssl = SSL_CONNECTION_GET_SSL(s);

    switch (ssl->method->version) {
    default:
        
        *min_version = *max_version = s->version;
        
        if (!ossl_assert(real_max == NULL))
            return ERR_R_INTERNAL_ERROR;
        return 0;
    case TLS_ANY_VERSION:
        table = tls_version_table;
        break;
    case DTLS_ANY_VERSION:
        table = dtls_version_table;
        break;
    }

    
    *min_version = version = 0;
    hole = 1;
    if (real_max != NULL)
        *real_max = 0;
    tmp_real_max = 0;
    for (vent = table; vent->version != 0; ++vent) {
        
        if (vent->cmeth == NULL) {
            hole = 1;
            tmp_real_max = 0;
            continue;
        }
        method = vent->cmeth();

        if (hole == 1 && tmp_real_max == 0)
            tmp_real_max = vent->version;

        if (ssl_method_error(s, method) != 0) {
            hole = 1;
        } else if (!hole) {
            *min_version = method->version;
        } else {
            if (real_max != NULL && tmp_real_max != 0)
                *real_max = tmp_real_max;
            version = method->version;
            *min_version = version;
            hole = 0;
        }
    }

    *max_version = version;

    
    if (version == 0)
        return SSL_R_NO_PROTOCOLS_AVAILABLE;

    return 0;
}


int ssl_set_client_hello_version(SSL_CONNECTION *s)
{
    int ver_min, ver_max, ret;

    
    if (!SSL_IS_FIRST_HANDSHAKE(s))
        return 0;

    ret = ssl_get_min_max_version(s, &ver_min, &ver_max, NULL);

    if (ret != 0)
        return ret;

    s->version = ver_max;

    if (SSL_CONNECTION_IS_DTLS(s)) {
        if (ver_max == DTLS1_BAD_VER) {
            
            if (!ssl_set_record_protocol_version(s, ver_max))
                return 0;
        }
    } else if (ver_max > TLS1_2_VERSION) {
        
        ver_max = TLS1_2_VERSION;
    }

    s->client_version = ver_max;
    return 0;
}


int check_in_list(SSL_CONNECTION *s, uint16_t group_id, const uint16_t *groups,
                  size_t num_groups, int checkallow)
{
    size_t i;

    if (groups == NULL || num_groups == 0)
        return 0;

    for (i = 0; i < num_groups; i++) {
        uint16_t group = groups[i];

        if (group_id == group
                && (!checkallow
                    || tls_group_allowed(s, group, SSL_SECOP_CURVE_CHECK))) {
            return 1;
        }
    }

    return 0;
}


int create_synthetic_message_hash(SSL_CONNECTION *s,
                                  const unsigned char *hashval,
                                  size_t hashlen, const unsigned char *hrr,
                                  size_t hrrlen)
{
    unsigned char hashvaltmp[EVP_MAX_MD_SIZE];
    unsigned char msghdr[SSL3_HM_HEADER_LENGTH];

    memset(msghdr, 0, sizeof(msghdr));

    if (hashval == NULL) {
        hashval = hashvaltmp;
        hashlen = 0;
        
        if (!ssl3_digest_cached_records(s, 0)
                || !ssl_handshake_hash(s, hashvaltmp, sizeof(hashvaltmp),
                                       &hashlen)) {
            
            return 0;
        }
    }

    
    if (!ssl3_init_finished_mac(s)) {
        
        return 0;
    }

    
    msghdr[0] = SSL3_MT_MESSAGE_HASH;
    msghdr[SSL3_HM_HEADER_LENGTH - 1] = (unsigned char)hashlen;
    if (!ssl3_finish_mac(s, msghdr, SSL3_HM_HEADER_LENGTH)
            || !ssl3_finish_mac(s, hashval, hashlen)) {
        
        return 0;
    }

    
    if (hrr != NULL
            && (!ssl3_finish_mac(s, hrr, hrrlen)
                || !ssl3_finish_mac(s, (unsigned char *)s->init_buf->data,
                                    s->s3.tmp.message_size
                                    + SSL3_HM_HEADER_LENGTH))) {
        
        return 0;
    }

    return 1;
}

static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b)
{
    return X509_NAME_cmp(*a, *b);
}

int parse_ca_names(SSL_CONNECTION *s, PACKET *pkt)
{
    STACK_OF(X509_NAME) *ca_sk = sk_X509_NAME_new(ca_dn_cmp);
    X509_NAME *xn = NULL;
    PACKET cadns;

    if (ca_sk == NULL) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_CRYPTO_LIB);
        goto err;
    }
    
    if (!PACKET_get_length_prefixed_2(pkt, &cadns)) {
        SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
        goto err;
    }

    while (PACKET_remaining(&cadns)) {
        const unsigned char *namestart, *namebytes;
        unsigned int name_len;

        if (!PACKET_get_net_2(&cadns, &name_len)
            || !PACKET_get_bytes(&cadns, &namebytes, name_len)) {
            SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_LENGTH_MISMATCH);
            goto err;
        }

        namestart = namebytes;
        if ((xn = d2i_X509_NAME(NULL, &namebytes, name_len)) == NULL) {
            SSLfatal(s, SSL_AD_DECODE_ERROR, ERR_R_ASN1_LIB);
            goto err;
        }
        if (namebytes != (namestart + name_len)) {
            SSLfatal(s, SSL_AD_DECODE_ERROR, SSL_R_CA_DN_LENGTH_MISMATCH);
            goto err;
        }

        if (!sk_X509_NAME_push(ca_sk, xn)) {
            SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_CRYPTO_LIB);
            goto err;
        }
        xn = NULL;
    }

    sk_X509_NAME_pop_free(s->s3.tmp.peer_ca_names, X509_NAME_free);
    s->s3.tmp.peer_ca_names = ca_sk;

    return 1;

 err:
    sk_X509_NAME_pop_free(ca_sk, X509_NAME_free);
    X509_NAME_free(xn);
    return 0;
}

const STACK_OF(X509_NAME) *get_ca_names(SSL_CONNECTION *s)
{
    const STACK_OF(X509_NAME) *ca_sk = NULL;
    SSL *ssl = SSL_CONNECTION_GET_SSL(s);

    if (s->server) {
        ca_sk = SSL_get_client_CA_list(ssl);
        if (ca_sk != NULL && sk_X509_NAME_num(ca_sk) == 0)
            ca_sk = NULL;
    }

    if (ca_sk == NULL)
        ca_sk = SSL_get0_CA_list(ssl);

    return ca_sk;
}

int construct_ca_names(SSL_CONNECTION *s, const STACK_OF(X509_NAME) *ca_sk,
                       WPACKET *pkt)
{
    
    if (!WPACKET_start_sub_packet_u16(pkt)) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        return 0;
    }

    if ((ca_sk != NULL) && !(s->options & SSL_OP_DISABLE_TLSEXT_CA_NAMES)) {
        int i;

        for (i = 0; i < sk_X509_NAME_num(ca_sk); i++) {
            unsigned char *namebytes;
            X509_NAME *name = sk_X509_NAME_value(ca_sk, i);
            int namelen;

            if (name == NULL
                    || (namelen = i2d_X509_NAME(name, NULL)) < 0
                    || !WPACKET_sub_allocate_bytes_u16(pkt, namelen,
                                                       &namebytes)
                    || i2d_X509_NAME(name, &namebytes) != namelen) {
                SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
                return 0;
            }
        }
    }

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

    return 1;
}


size_t construct_key_exchange_tbs(SSL_CONNECTION *s, unsigned char **ptbs,
                                  const void *param, size_t paramlen)
{
    size_t tbslen = 2 * SSL3_RANDOM_SIZE + paramlen;
    unsigned char *tbs = OPENSSL_malloc(tbslen);

    if (tbs == NULL) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_CRYPTO_LIB);
        return 0;
    }
    memcpy(tbs, s->s3.client_random, SSL3_RANDOM_SIZE);
    memcpy(tbs + SSL3_RANDOM_SIZE, s->s3.server_random, SSL3_RANDOM_SIZE);

    memcpy(tbs + SSL3_RANDOM_SIZE * 2, param, paramlen);

    *ptbs = tbs;
    return tbslen;
}


int tls13_save_handshake_digest_for_pha(SSL_CONNECTION *s)
{
    if (s->pha_dgst == NULL) {
        if (!ssl3_digest_cached_records(s, 1))
            
            return 0;

        s->pha_dgst = EVP_MD_CTX_new();
        if (s->pha_dgst == NULL) {
            SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
            return 0;
        }
        if (!EVP_MD_CTX_copy_ex(s->pha_dgst,
                                s->s3.handshake_dgst)) {
            SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
            EVP_MD_CTX_free(s->pha_dgst);
            s->pha_dgst = NULL;
            return 0;
        }
    }
    return 1;
}


int tls13_restore_handshake_digest_for_pha(SSL_CONNECTION *s)
{
    if (s->pha_dgst == NULL) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        return 0;
    }
    if (!EVP_MD_CTX_copy_ex(s->s3.handshake_dgst,
                            s->pha_dgst)) {
        SSLfatal(s, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        return 0;
    }
    return 1;
}

#ifndef OPENSSL_NO_COMP_ALG
MSG_PROCESS_RETURN tls13_process_compressed_certificate(SSL_CONNECTION *sc,
                                                        PACKET *pkt,
                                                        PACKET *tmppkt,
                                                        BUF_MEM *buf)
{
    MSG_PROCESS_RETURN ret = MSG_PROCESS_ERROR;
    int comp_alg;
    COMP_METHOD *method = NULL;
    COMP_CTX *comp = NULL;
    size_t expected_length;
    size_t comp_length;
    int i;
    int found = 0;

    if (buf == NULL) {
        SSLfatal(sc, SSL_AD_INTERNAL_ERROR, ERR_R_INTERNAL_ERROR);
        goto err;
    }
    if (!PACKET_get_net_2(pkt, (unsigned int*)&comp_alg)) {
        SSLfatal(sc, SSL_AD_BAD_CERTIFICATE, ERR_R_INTERNAL_ERROR);
        goto err;
    }
    
    if (sc->cert_comp_prefs[0] != TLSEXT_comp_cert_none) {
        for (i = 0; sc->cert_comp_prefs[i] != TLSEXT_comp_cert_none; i++) {
            if (sc->cert_comp_prefs[i] == comp_alg) {
                found = 1;
                break;
            }
        }
        if (!found) {
            SSLfatal(sc, SSL_AD_BAD_CERTIFICATE, SSL_R_BAD_COMPRESSION_ALGORITHM);
            goto err;
        }
    }
    if (!ossl_comp_has_alg(comp_alg)) {
        SSLfatal(sc, SSL_AD_BAD_CERTIFICATE, SSL_R_BAD_COMPRESSION_ALGORITHM);
        goto err;
    }
    switch (comp_alg) {
    case TLSEXT_comp_cert_zlib:
        method = COMP_zlib_oneshot();
        break;
    case TLSEXT_comp_cert_brotli:
        method = COMP_brotli_oneshot();
        break;
    case TLSEXT_comp_cert_zstd:
        method = COMP_zstd_oneshot();
        break;
    default:
        SSLfatal(sc, SSL_AD_BAD_CERTIFICATE, SSL_R_BAD_COMPRESSION_ALGORITHM);
        goto err;
    }

    if ((comp = COMP_CTX_new(method)) == NULL
        || !PACKET_get_net_3_len(pkt, &expected_length)
        || !PACKET_get_net_3_len(pkt, &comp_length)
        || PACKET_remaining(pkt) != comp_length
        || !BUF_MEM_grow(buf, expected_length)
        || !PACKET_buf_init(tmppkt, (unsigned char *)buf->data, expected_length)
        || COMP_expand_block(comp, (unsigned char *)buf->data, expected_length,
                             (unsigned char*)PACKET_data(pkt), comp_length) != (int)expected_length) {
        SSLfatal(sc, SSL_AD_BAD_CERTIFICATE, SSL_R_BAD_DECOMPRESSION);
        goto err;
    }
    ret = MSG_PROCESS_CONTINUE_PROCESSING;
 err:
    COMP_CTX_free(comp);
    return ret;
}
#endif
