Exemplo n.º 1
0
/** Send the establish-rendezvous cell along a rendezvous circuit. if
 * it fails, mark the circ for close and return -1. else return 0.
 */
static int
rend_client_send_establish_rendezvous(origin_circuit_t *circ)
{
  tor_assert(circ->base_.purpose == CIRCUIT_PURPOSE_C_ESTABLISH_REND);
  tor_assert(circ->rend_data);
  log_info(LD_REND, "Sending an ESTABLISH_RENDEZVOUS cell");

  if (crypto_rand(circ->rend_data->rend_cookie, REND_COOKIE_LEN) < 0) {
    log_warn(LD_BUG, "Internal error: Couldn't produce random cookie.");
    circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_INTERNAL);
    return -1;
  }

  /* Set timestamp_dirty, because circuit_expire_building expects it,
   * and the rend cookie also means we've used the circ. */
  circ->base_.timestamp_dirty = time(NULL);

  /* We've attempted to use this circuit. Probe it if we fail */
  pathbias_count_use_attempt(circ);

  if (relay_send_command_from_edge(0, TO_CIRCUIT(circ),
                                   RELAY_COMMAND_ESTABLISH_RENDEZVOUS,
                                   circ->rend_data->rend_cookie,
                                   REND_COOKIE_LEN,
                                   circ->cpath->prev)<0) {
    /* circ is already marked for close */
    log_warn(LD_GENERAL, "Couldn't send ESTABLISH_RENDEZVOUS cell");
    return -1;
  }

  return 0;
}
Exemplo n.º 2
0
/* Send an ESTABLISH_RENDEZVOUS cell along the rendezvous circuit circ. On
 * success, 0 is returned else -1 and the circuit is marked for close. */
int
hs_circ_send_establish_rendezvous(origin_circuit_t *circ)
{
  ssize_t cell_len = 0;
  uint8_t cell[RELAY_PAYLOAD_SIZE] = {0};

  tor_assert(circ);
  tor_assert(TO_CIRCUIT(circ)->purpose == CIRCUIT_PURPOSE_C_ESTABLISH_REND);

  log_info(LD_REND, "Send an ESTABLISH_RENDEZVOUS cell on circuit %u",
           TO_CIRCUIT(circ)->n_circ_id);

  /* Set timestamp_dirty, because circuit_expire_building expects it,
   * and the rend cookie also means we've used the circ. */
  TO_CIRCUIT(circ)->timestamp_dirty = time(NULL);

  /* We've attempted to use this circuit. Probe it if we fail */
  pathbias_count_use_attempt(circ);

  /* Generate the RENDEZVOUS_COOKIE and place it in the identifier so we can
   * complete the handshake when receiving the acknowledgement. */
  crypto_rand((char *) circ->hs_ident->rendezvous_cookie, HS_REND_COOKIE_LEN);
  /* Generate the client keypair. No need to be extra strong, not long term */
  curve25519_keypair_generate(&circ->hs_ident->rendezvous_client_kp, 0);

  cell_len =
    hs_cell_build_establish_rendezvous(circ->hs_ident->rendezvous_cookie,
                                       cell);
  if (BUG(cell_len < 0)) {
    goto err;
  }

  if (relay_send_command_from_edge(CONTROL_CELL_ID, TO_CIRCUIT(circ),
                                   RELAY_COMMAND_ESTABLISH_RENDEZVOUS,
                                   (const char *) cell, cell_len,
                                   circ->cpath->prev) < 0) {
    /* Circuit has been marked for close */
    log_warn(LD_REND, "Unable to send ESTABLISH_RENDEZVOUS cell on "
                      "circuit %u", TO_CIRCUIT(circ)->n_circ_id);
    memwipe(cell, 0, cell_len);
    goto err;
  }

  memwipe(cell, 0, cell_len);
  return 0;
 err:
  return -1;
}
Exemplo n.º 3
0
/* For a given introduction point and an introduction circuit, send the
 * ESTABLISH_INTRO cell. The service object is used for logging. This can fail
 * and if so, the circuit is closed and the intro point object is flagged
 * that the circuit is not established anymore which is important for the
 * retry mechanism. */
static void
send_establish_intro(const hs_service_t *service,
                     hs_service_intro_point_t *ip, origin_circuit_t *circ)
{
  ssize_t cell_len;
  uint8_t payload[RELAY_PAYLOAD_SIZE];

  tor_assert(service);
  tor_assert(ip);
  tor_assert(circ);

  /* Encode establish intro cell. */
  cell_len = hs_cell_build_establish_intro(circ->cpath->prev->rend_circ_nonce,
                                           ip, payload);
  if (cell_len < 0) {
    log_warn(LD_REND, "Unable to encode ESTABLISH_INTRO cell for service %s "
                      "on circuit %u. Closing circuit.",
             safe_str_client(service->onion_address),
             TO_CIRCUIT(circ)->n_circ_id);
    goto err;
  }

  /* Send the cell on the circuit. */
  if (relay_send_command_from_edge(CONTROL_CELL_ID, TO_CIRCUIT(circ),
                                   RELAY_COMMAND_ESTABLISH_INTRO,
                                   (char *) payload, cell_len,
                                   circ->cpath->prev) < 0) {
    log_info(LD_REND, "Unable to send ESTABLISH_INTRO cell for service %s "
                      "on circuit %u.",
             safe_str_client(service->onion_address),
             TO_CIRCUIT(circ)->n_circ_id);
    /* On error, the circuit has been closed. */
    goto done;
  }

  /* Record the attempt to use this circuit. */
  pathbias_count_use_attempt(circ);
  goto done;

 err:
  circuit_mark_for_close(TO_CIRCUIT(circ), END_CIRC_REASON_INTERNAL);
 done:
  memwipe(payload, 0, sizeof(payload));
}