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 "ipc/attachment_broker.h"
   8
   9 #if USE_ATTACHMENT_BROKER
  10 #include "crypto/random.h"
  11 #endif
  12
  13 namespace IPC {
  14
  15
  16 #if USE_ATTACHMENT_BROKER
  17 BrokerableAttachment::AttachmentId::AttachmentId() {
  18 // In order to prevent mutually untrusted processes from stealing resources from
  19 // one another, the nonce must be secret. This generates a 128-bit,
  20 // cryptographicaly-strong random number.
  21   crypto::RandBytes(nonce, BrokerableAttachment::kNonceSize);
  22 }
  23 #else
  24 BrokerableAttachment::AttachmentId::AttachmentId() {
  25   CHECK(false) << "Not allowed to construct an attachment id if the platform "
  26                   "does not support attachment brokering.";
  27 }
  28 #endif
  29
  30 BrokerableAttachment::AttachmentId::AttachmentId(const char* start_address,
  31                                                  size_t size) {
  32   DCHECK(size == BrokerableAttachment::kNonceSize);
  33   for (size_t i = 0; i < BrokerableAttachment::kNonceSize; ++i)
  34     nonce[i] = start_address[i];
  35 }
  36
  37 void BrokerableAttachment::AttachmentId::SerializeToBuffer(char* start_address,
  38                                                            size_t size) {
  39   DCHECK(size == BrokerableAttachment::kNonceSize);
  40   for (size_t i = 0; i < BrokerableAttachment::kNonceSize; ++i)
  41     start_address[i] = nonce[i];
  42 }
  43
  44 BrokerableAttachment::BrokerableAttachment()
  45     : needs_brokering_(false) {}
  46
  47 BrokerableAttachment::BrokerableAttachment(const AttachmentId& id,
  48                                            bool needs_brokering)
  49     : id_(id), needs_brokering_(needs_brokering) {}
  50
  51 BrokerableAttachment::~BrokerableAttachment() {
  52 }
  53
  54 BrokerableAttachment::AttachmentId BrokerableAttachment::GetIdentifier() const {
  55   return id_;
  56 }
  57
  58 bool BrokerableAttachment::NeedsBrokering() const {
  59   return needs_brokering_;
  60 }
  61
  62 void BrokerableAttachment::SetNeedsBrokering(bool needs_brokering) {
  63   needs_brokering_ = needs_brokering;
  64 }
  65
  66 BrokerableAttachment::Type BrokerableAttachment::GetType() const {
  67   return TYPE_BROKERABLE_ATTACHMENT;
  68 }
  69
  70 }  // namespace IPC