ssl/d1_lib.c


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/*
 * Copyright 2005-2022 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (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 "internal/e_os.h"
#include <stdio.h>
#include <openssl/objects.h>
#include <openssl/rand.h>
#include "ssl_local.h"
#include "internal/time.h"

static int dtls1_handshake_write(SSL_CONNECTION *s);
static size_t dtls1_link_min_mtu(void);

/* XDTLS:  figure out the right values */
static const size_t g_probable_mtu[] = { 1500, 512, 256 };

const SSL3_ENC_METHOD DTLSv1_enc_data = {
    tls1_setup_key_block,
    tls1_generate_master_secret,
    tls1_change_cipher_state,
    tls1_final_finish_mac,
    TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
    TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
    tls1_alert_code,
    tls1_export_keying_material,
    SSL_ENC_FLAG_DTLS | SSL_ENC_FLAG_EXPLICIT_IV,
    dtls1_set_handshake_header,
    dtls1_close_construct_packet,
    dtls1_handshake_write
};

const SSL3_ENC_METHOD DTLSv1_2_enc_data = {
    tls1_setup_key_block,
    tls1_generate_master_secret,
    tls1_change_cipher_state,
    tls1_final_finish_mac,
    TLS_MD_CLIENT_FINISH_CONST, TLS_MD_CLIENT_FINISH_CONST_SIZE,
    TLS_MD_SERVER_FINISH_CONST, TLS_MD_SERVER_FINISH_CONST_SIZE,
    tls1_alert_code,
    tls1_export_keying_material,
    SSL_ENC_FLAG_DTLS | SSL_ENC_FLAG_EXPLICIT_IV | SSL_ENC_FLAG_SIGALGS
        | SSL_ENC_FLAG_SHA256_PRF | SSL_ENC_FLAG_TLS1_2_CIPHERS,
    dtls1_set_handshake_header,
    dtls1_close_construct_packet,
    dtls1_handshake_write
};

OSSL_TIME dtls1_default_timeout(void)
{
    /*
     * 2 hours, the 24 hours mentioned in the DTLSv1 spec is way too long for
     * http, the cache would over fill
     */
    return ossl_seconds2time(60 * 60 * 2);
}

int dtls1_new(SSL *ssl)
{
    DTLS1_STATE *d1;
    SSL_CONNECTION *s = SSL_CONNECTION_FROM_SSL_ONLY(ssl);

    if (s == NULL)
        return 0;

    if (!DTLS_RECORD_LAYER_new(&s->rlayer)) {
        return 0;
    }

    if (!ssl3_new(ssl))
        return 0;
    if ((d1 = OPENSSL_zalloc(sizeof(*d1))) == NULL) {
        ssl3_free(ssl);
        return 0;
    }

    d1->buffered_messages = pqueue_new();
    d1->sent_messages = pqueue_new();

    if (s->server) {
        d1->cookie_len = sizeof(s->d1->cookie);