C++ (Cpp) ssl_early_callback_get_extension Examples

Example #1

File: tls13_server.c Project: gfxcc/iShareOC

static int resolve_ecdhe_secret(SSL *ssl, int *out_need_retry,
                                struct ssl_early_callback_ctx *early_ctx) {
  *out_need_retry = 0;
  SSL_HANDSHAKE *hs = ssl->s3->hs;

  if (ssl->s3->tmp.new_cipher->algorithm_mkey != SSL_kECDHE) {
    return tls13_advance_key_schedule(ssl, kZeroes, hs->hash_len);
  }

  CBS key_share;
  if (!ssl_early_callback_get_extension(early_ctx, &key_share,
                                        TLSEXT_TYPE_key_share)) {
    OPENSSL_PUT_ERROR(SSL, SSL_R_MISSING_KEY_SHARE);
    ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_MISSING_EXTENSION);
    return ssl_hs_error;
  }

  int found_key_share;
  uint8_t *dhe_secret;
  size_t dhe_secret_len;
  uint8_t alert;
  if (!ssl_ext_key_share_parse_clienthello(ssl, &found_key_share, &dhe_secret,
                                           &dhe_secret_len, &alert,
                                           &key_share)) {
    ssl3_send_alert(ssl, SSL3_AL_FATAL, alert);
    return 0;
  }

  if (!found_key_share) {
    *out_need_retry = 1;
    return 0;
  }

  int ok = tls13_advance_key_schedule(ssl, dhe_secret, dhe_secret_len);
  OPENSSL_free(dhe_secret);
  return ok;
}

Example #2

File: tls13_server.c Project: eggyo/eggyo-node

static enum ssl_hs_wait_t do_process_client_hello(SSL *ssl, SSL_HANDSHAKE *hs) {
  if (!tls13_check_message_type(ssl, SSL3_MT_CLIENT_HELLO)) {
    return ssl_hs_error;
  }

  struct ssl_early_callback_ctx client_hello;
  if (!ssl_early_callback_init(ssl, &client_hello, ssl->init_msg,
                               ssl->init_num)) {
    OPENSSL_PUT_ERROR(SSL, SSL_R_CLIENTHELLO_PARSE_FAILED);
    ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
    return ssl_hs_error;
  }

  assert(ssl->s3->have_version);

  /* Load the client random. */
  if (client_hello.random_len != SSL3_RANDOM_SIZE) {
    OPENSSL_PUT_ERROR(SSL, ERR_R_INTERNAL_ERROR);
    return -1;
  }
  memcpy(ssl->s3->client_random, client_hello.random, client_hello.random_len);

  uint8_t alert = SSL_AD_DECODE_ERROR;
  SSL_SESSION *session = NULL;
  CBS pre_shared_key;
  if (ssl_early_callback_get_extension(&client_hello, &pre_shared_key,
                                       TLSEXT_TYPE_pre_shared_key) &&
      !ssl_ext_pre_shared_key_parse_clienthello(ssl, &session, &alert,
                                                &pre_shared_key)) {
    ssl3_send_alert(ssl, SSL3_AL_FATAL, alert);
    return 0;
  }

  uint16_t resumption_cipher;
  if (session != NULL &&
      /* We currently only support ECDHE-PSK resumption. */
      ((session->ticket_flags & SSL_TICKET_ALLOW_DHE_RESUMPTION) == 0 ||
       /* Only resume if the session's version matches. */
       session->ssl_version != ssl->version ||
       !ssl_cipher_get_ecdhe_psk_cipher(session->cipher, &resumption_cipher) ||
       !ssl_client_cipher_list_contains_cipher(&client_hello,
                                               resumption_cipher))) {
    SSL_SESSION_free(session);
    session = NULL;
  }

  if (session == NULL) {
    if (!ssl_get_new_session(ssl, 1 /* server */)) {
      ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
      return ssl_hs_error;
    }
  } else {
    /* Only authentication information carries over in TLS 1.3. */
    ssl->s3->new_session = SSL_SESSION_dup(session, SSL_SESSION_DUP_AUTH_ONLY);
    if (ssl->s3->new_session == NULL) {
      ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
      return ssl_hs_error;
    }
    ssl->s3->session_reused = 1;
    SSL_SESSION_free(session);
  }

  if (ssl->ctx->dos_protection_cb != NULL &&
      ssl->ctx->dos_protection_cb(&client_hello) == 0) {
    /* Connection rejected for DOS reasons. */
    OPENSSL_PUT_ERROR(SSL, SSL_R_CONNECTION_REJECTED);
    ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
    return ssl_hs_error;
  }

  /* TLS 1.3 requires the peer only advertise the null compression. */
  if (client_hello.compression_methods_len != 1 ||
      client_hello.compression_methods[0] != 0) {
    OPENSSL_PUT_ERROR(SSL, SSL_R_INVALID_COMPRESSION_LIST);
    ssl3_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_ILLEGAL_PARAMETER);
    return ssl_hs_error;
  }

  /* TLS extensions. */
  if (!ssl_parse_clienthello_tlsext(ssl, &client_hello)) {
    OPENSSL_PUT_ERROR(SSL, SSL_R_PARSE_TLSEXT);
    return ssl_hs_error;
  }

  hs->state = state_select_parameters;
  return ssl_hs_ok;
}