ipc/brokerable_attachment.cc

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ipc/brokerable_attachment.h"
   6
   7 #include "crypto/random.h"
   8
   9 namespace IPC {
  10
  11 namespace {
  12
  13 // In order to prevent mutually untrusted processes from stealing resources from
  14 // one another, the nonce must be secret. This generates a 128-bit,
  15 // cryptographicaly-strong random number.
  16 BrokerableAttachment::AttachmentId GetRandomId() {
  17   BrokerableAttachment::AttachmentId id;
  18   crypto::RandBytes(id.nonce, BrokerableAttachment::kNonceSize);
  19   return id;
  20 }
  21
  22 }  // namespace
  23
  24 BrokerableAttachment::BrokerableAttachment()
  25     : id_(GetRandomId()), needs_brokering_(false) {}
  26
  27 BrokerableAttachment::BrokerableAttachment(const AttachmentId& id,
  28                                            bool needs_brokering)
  29     : id_(id), needs_brokering_(needs_brokering) {}
  30
  31 BrokerableAttachment::~BrokerableAttachment() {
  32 }
  33
  34 BrokerableAttachment::AttachmentId BrokerableAttachment::GetIdentifier() const {
  35   return id_;
  36 }
  37
  38 bool BrokerableAttachment::NeedsBrokering() const {
  39   return needs_brokering_;
  40 }
  41
  42 void BrokerableAttachment::SetNeedsBrokering(bool needs_brokering) {
  43   needs_brokering_ = needs_brokering;
  44 }
  45
  46 BrokerableAttachment::Type BrokerableAttachment::GetType() const {
  47   return TYPE_BROKERABLE_ATTACHMENT;
  48 }
  49
  50 }  // namespace IPC