/*

 * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

#include "ssl_locl.h"

int ssl3_do_change_cipher_spec(SSL *s)

{

    int i;

    if (s->server)

        i = SSL3_CHANGE_CIPHER_SERVER_READ;

    else

        i = SSL3_CHANGE_CIPHER_CLIENT_READ;

    if (s->s3->tmp.key_block == NULL) {

        if (s->session == NULL || s->session->master_key_length == 0) {

            /* might happen if dtls1_read_bytes() calls this */

            SSLerr(SSL_F_SSL3_DO_CHANGE_CIPHER_SPEC, SSL_R_CCS_RECEIVED_EARLY);

            return 0;

        }

        s->session->cipher = s->s3->tmp.new_cipher;

        if (!s->method->ssl3_enc->setup_key_block(s))

            return 0;

    }

    if (!s->method->ssl3_enc->change_cipher_state(s, i))

        return 0;

    return 1;

}

int ssl3_send_alert(SSL *s, int level, int desc)

{

    /* Map tls/ssl alert value to correct one */

    if (SSL_TREAT_AS_TLS13(s))

        desc = tls13_alert_code(desc);

    else

        desc = s->method->ssl3_enc->alert_value(desc);

    if (s->version == SSL3_VERSION && desc == SSL_AD_PROTOCOL_VERSION)

        desc = SSL_AD_HANDSHAKE_FAILURE; /* SSL 3.0 does not have

                                          * protocol_version alerts */

    if (desc < 0)

        return -1;

    /* If a fatal one, remove from cache */

    if ((level == SSL3_AL_FATAL) && (s->session != NULL))

        SSL_CTX_remove_session(s->session_ctx, s->session);

    s->s3->alert_dispatch = 1;

    s->s3->send_alert[0] = level;

    s->s3->send_alert[1] = desc;

    if (!RECORD_LAYER_write_pending(&s->rlayer)) {

        /* data still being written out? */

        return s->method->ssl_dispatch_alert(s);

    }

    /*

     * else data is still being written out, we will get written some time in

     * the future

     */

    return -1;

}

int ssl3_dispatch_alert(SSL *s)

{

    int i, j;

    size_t alertlen;

    void (*cb) (const SSL *ssl, int type, int val) = NULL;

    size_t written;

    s->s3->alert_dispatch = 0;

    alertlen = 2;

    i = do_ssl3_write(s, SSL3_RT_ALERT, &s->s3->send_alert[0], &alertlen, 1, 0,

                      &written);

    if (i <= 0) {

        s->s3->alert_dispatch = 1;

    } else {

        /*

         * Alert sent to BIO - now flush. If the message does not get sent due

         * to non-blocking IO, we will not worry too much.

         */

        (void)BIO_flush(s->wbio);

        if (s->msg_callback)

            s->msg_callback(1, s->version, SSL3_RT_ALERT, s->s3->send_alert,

                            2, s, s->msg_callback_arg);

        if (s->info_callback != NULL)

            cb = s->info_callback;

        else if (s->ctx->info_callback != NULL)

            cb = s->ctx->info_callback;

        if (cb != NULL) {

            j = (s->s3->send_alert[0] << 8) | s->s3->send_alert[1];

            cb(s, SSL_CB_WRITE_ALERT, j);

        }

    }

    return i;

}