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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/renderer_host/pepper/pepper_security_helper.h"
#include "base/logging.h"
#include "content/browser/child_process_security_policy_impl.h"
#include "ppapi/c/ppb_file_io.h"
namespace content {
namespace {
template <typename CanRead, typename CanWrite,
typename CanCreate, typename CanCreateReadWrite,
typename FileID>
bool CanOpenFileWithPepperFlags(CanRead can_read,
CanWrite can_write,
CanCreate can_create,
CanCreateReadWrite can_create_read_write,
int pp_open_flags,
int child_id,
const FileID& file) {
ChildProcessSecurityPolicyImpl* policy =
ChildProcessSecurityPolicyImpl::GetInstance();
bool pp_read = !!(pp_open_flags & PP_FILEOPENFLAG_READ);
bool pp_write = !!(pp_open_flags & PP_FILEOPENFLAG_WRITE);
bool pp_create = !!(pp_open_flags & PP_FILEOPENFLAG_CREATE);
bool pp_truncate = !!(pp_open_flags & PP_FILEOPENFLAG_TRUNCATE);
bool pp_exclusive = !!(pp_open_flags & PP_FILEOPENFLAG_EXCLUSIVE);
bool pp_append = !!(pp_open_flags & PP_FILEOPENFLAG_APPEND);
if (pp_read && !(policy->*can_read)(child_id, file))
return false;
if (pp_write && !(policy->*can_write)(child_id, file))
return false;
// TODO(tommycli): Maybe tighten up required permission. crbug.com/284792
if (pp_append && !(policy->*can_create_read_write)(child_id, file))
return false;
if (pp_truncate && !pp_write)
return false;
if (pp_create) {
if (pp_exclusive) {
return (policy->*can_create)(child_id, file);
} else {
// Asks for too much, but this is the only grant that allows overwrite.
return (policy->*can_create_read_write)(child_id, file);
}
} else if (pp_truncate) {
return (policy->*can_create_read_write)(child_id, file);
}
return true;
}
}
bool CanOpenWithPepperFlags(int pp_open_flags, int child_id,
const base::FilePath& file) {
return CanOpenFileWithPepperFlags(
&ChildProcessSecurityPolicyImpl::CanReadFile,
&ChildProcessSecurityPolicyImpl::CanCreateReadWriteFile,
&ChildProcessSecurityPolicyImpl::CanCreateReadWriteFile,
&ChildProcessSecurityPolicyImpl::CanCreateReadWriteFile,
pp_open_flags, child_id, file);
}
bool CanOpenFileSystemURLWithPepperFlags(int pp_open_flags, int child_id,
const fileapi::FileSystemURL& url) {
return CanOpenFileWithPepperFlags(
&ChildProcessSecurityPolicyImpl::CanReadFileSystemFile,
&ChildProcessSecurityPolicyImpl::CanWriteFileSystemFile,
&ChildProcessSecurityPolicyImpl::CanCreateFileSystemFile,
&ChildProcessSecurityPolicyImpl::CanCreateReadWriteFileSystemFile,
pp_open_flags, child_id, url);
}
} // namespace content
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