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// Copyright (c) 2006-2008 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 "sandbox/win/src/registry_interception.h"
#include <stdint.h>
#include "sandbox/win/src/crosscall_client.h"
#include "sandbox/win/src/ipc_tags.h"
#include "sandbox/win/src/policy_params.h"
#include "sandbox/win/src/policy_target.h"
#include "sandbox/win/src/sandbox_factory.h"
#include "sandbox/win/src/sandbox_nt_util.h"
#include "sandbox/win/src/sharedmem_ipc_client.h"
#include "sandbox/win/src/target_services.h"
#include "mozilla/sandboxing/sandboxLogging.h"
namespace sandbox {
NTSTATUS WINAPI TargetNtCreateKey(NtCreateKeyFunction orig_CreateKey,
PHANDLE key,
ACCESS_MASK desired_access,
POBJECT_ATTRIBUTES object_attributes,
ULONG title_index,
PUNICODE_STRING class_name,
ULONG create_options,
PULONG disposition) {
// Check if the process can create it first.
NTSTATUS status =
orig_CreateKey(key, desired_access, object_attributes, title_index,
class_name, create_options, disposition);
if (NT_SUCCESS(status))
return status;
if (STATUS_OBJECT_NAME_NOT_FOUND != status) {
mozilla::sandboxing::LogBlocked("NtCreateKey",
object_attributes->ObjectName->Buffer,
object_attributes->ObjectName->Length);
}
// We don't trust that the IPC can work this early.
if (!SandboxFactory::GetTargetServices()->GetState()->InitCalled())
return status;
do {
if (!ValidParameter(key, sizeof(HANDLE), WRITE))
break;
if (disposition && !ValidParameter(disposition, sizeof(ULONG), WRITE))
break;
// At this point we don't support class_name.
if (class_name && class_name->Buffer && class_name->Length)
break;
// We don't support creating link keys, volatile keys and backup/restore.
if (create_options)
break;
void* memory = GetGlobalIPCMemory();
if (!memory)
break;
std::unique_ptr<wchar_t, NtAllocDeleter> name;
uint32_t attributes = 0;
HANDLE root_directory = 0;
NTSTATUS ret = AllocAndCopyName(object_attributes, &name, &attributes,
&root_directory);
if (!NT_SUCCESS(ret) || !name)
break;
uint32_t desired_access_uint32 = desired_access;
CountedParameterSet<OpenKey> params;
params[OpenKey::ACCESS] = ParamPickerMake(desired_access_uint32);
bool query_broker = false;
{
std::unique_ptr<wchar_t, NtAllocDeleter> full_name;
const wchar_t* name_ptr = name.get();
const wchar_t* full_name_ptr = nullptr;
if (root_directory) {
ret = sandbox::AllocAndGetFullPath(root_directory, name.get(),
&full_name);
if (!NT_SUCCESS(ret) || !full_name)
break;
full_name_ptr = full_name.get();
params[OpenKey::NAME] = ParamPickerMake(full_name_ptr);
} else {
params[OpenKey::NAME] = ParamPickerMake(name_ptr);
}
query_broker = QueryBroker(IpcTag::NTCREATEKEY, params.GetBase());
}
if (!query_broker)
break;
SharedMemIPCClient ipc(memory);
CrossCallReturn answer = {0};
ResultCode code = CrossCall(ipc, IpcTag::NTCREATEKEY, name.get(),
attributes, root_directory, desired_access,
title_index, create_options, &answer);
if (SBOX_ALL_OK != code)
break;
if (!NT_SUCCESS(answer.nt_status))
// TODO(nsylvain): We should return answer.nt_status here instead
// of status. We can do this only after we checked the policy.
// otherwise we will returns ACCESS_DENIED for all paths
// that are not specified by a policy, even though your token allows
// access to that path, and the original call had a more meaningful
// error. Bug 4369
break;
__try {
*key = answer.handle;
if (disposition)
*disposition = answer.extended[0].unsigned_int;
status = answer.nt_status;
} __except (EXCEPTION_EXECUTE_HANDLER) {
break;
}
mozilla::sandboxing::LogAllowed("NtCreateKey",
object_attributes->ObjectName->Buffer,
object_attributes->ObjectName->Length);
} while (false);
return status;
}
NTSTATUS WINAPI CommonNtOpenKey(NTSTATUS status,
PHANDLE key,
ACCESS_MASK desired_access,
POBJECT_ATTRIBUTES object_attributes) {
// We don't trust that the IPC can work this early.
if (!SandboxFactory::GetTargetServices()->GetState()->InitCalled())
return status;
do {
if (!ValidParameter(key, sizeof(HANDLE), WRITE))
break;
void* memory = GetGlobalIPCMemory();
if (!memory)
break;
std::unique_ptr<wchar_t, NtAllocDeleter> name;
uint32_t attributes;
HANDLE root_directory;
NTSTATUS ret = AllocAndCopyName(object_attributes, &name, &attributes,
&root_directory);
if (!NT_SUCCESS(ret) || !name)
break;
uint32_t desired_access_uint32 = desired_access;
CountedParameterSet<OpenKey> params;
params[OpenKey::ACCESS] = ParamPickerMake(desired_access_uint32);
bool query_broker = false;
{
std::unique_ptr<wchar_t, NtAllocDeleter> full_name;
const wchar_t* name_ptr = name.get();
const wchar_t* full_name_ptr = nullptr;
if (root_directory) {
ret = sandbox::AllocAndGetFullPath(root_directory, name.get(),
&full_name);
if (!NT_SUCCESS(ret) || !full_name)
break;
full_name_ptr = full_name.get();
params[OpenKey::NAME] = ParamPickerMake(full_name_ptr);
} else {
params[OpenKey::NAME] = ParamPickerMake(name_ptr);
}
query_broker = QueryBroker(IpcTag::NTOPENKEY, params.GetBase());
}
if (!query_broker)
break;
SharedMemIPCClient ipc(memory);
CrossCallReturn answer = {0};
ResultCode code = CrossCall(ipc, IpcTag::NTOPENKEY, name.get(), attributes,
root_directory, desired_access, &answer);
if (SBOX_ALL_OK != code)
break;
if (!NT_SUCCESS(answer.nt_status))
// TODO(nsylvain): We should return answer.nt_status here instead
// of status. We can do this only after we checked the policy.
// otherwise we will returns ACCESS_DENIED for all paths
// that are not specified by a policy, even though your token allows
// access to that path, and the original call had a more meaningful
// error. Bug 4369
break;
__try {
*key = answer.handle;
status = answer.nt_status;
} __except (EXCEPTION_EXECUTE_HANDLER) {
break;
}
mozilla::sandboxing::LogAllowed("NtOpenKey[Ex]",
object_attributes->ObjectName->Buffer,
object_attributes->ObjectName->Length);
} while (false);
return status;
}
NTSTATUS WINAPI TargetNtOpenKey(NtOpenKeyFunction orig_OpenKey,
PHANDLE key,
ACCESS_MASK desired_access,
POBJECT_ATTRIBUTES object_attributes) {
// Check if the process can open it first.
NTSTATUS status = orig_OpenKey(key, desired_access, object_attributes);
if (NT_SUCCESS(status))
return status;
if (STATUS_OBJECT_NAME_NOT_FOUND != status) {
mozilla::sandboxing::LogBlocked("NtOpenKey",
object_attributes->ObjectName->Buffer,
object_attributes->ObjectName->Length);
}
return CommonNtOpenKey(status, key, desired_access, object_attributes);
}
NTSTATUS WINAPI TargetNtOpenKeyEx(NtOpenKeyExFunction orig_OpenKeyEx,
PHANDLE key,
ACCESS_MASK desired_access,
POBJECT_ATTRIBUTES object_attributes,
ULONG open_options) {
// Check if the process can open it first.
NTSTATUS status =
orig_OpenKeyEx(key, desired_access, object_attributes, open_options);
// We do not support open_options at this time. The 2 current known values
// are REG_OPTION_CREATE_LINK, to open a symbolic link, and
// REG_OPTION_BACKUP_RESTORE to open the key with special privileges.
if (NT_SUCCESS(status) || open_options != 0)
return status;
if (STATUS_OBJECT_NAME_NOT_FOUND != status) {
mozilla::sandboxing::LogBlocked("NtOpenKeyEx",
object_attributes->ObjectName->Buffer,
object_attributes->ObjectName->Length);
}
return CommonNtOpenKey(status, key, desired_access, object_attributes);
}
} // namespace sandbox
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