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