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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 "sandbox/win/src/crosscall_client.h"
#include "sandbox/win/src/ipc_tags.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"
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;
// 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 (NULL == memory)
break;
wchar_t* name;
uint32 attributes = 0;
HANDLE root_directory = 0;
NTSTATUS ret = AllocAndCopyName(object_attributes, &name, &attributes,
&root_directory);
if (!NT_SUCCESS(ret) || NULL == name)
break;
SharedMemIPCClient ipc(memory);
CrossCallReturn answer = {0};
ResultCode code = CrossCall(ipc, IPC_NTCREATEKEY_TAG, name, attributes,
root_directory, desired_access, title_index,
create_options, &answer);
operator delete(name, NT_ALLOC);
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;
}
} 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 (NULL == memory)
break;
wchar_t* name;
uint32 attributes;
HANDLE root_directory;
NTSTATUS ret = AllocAndCopyName(object_attributes, &name, &attributes,
&root_directory);
if (!NT_SUCCESS(ret) || NULL == name)
break;
SharedMemIPCClient ipc(memory);
CrossCallReturn answer = {0};
ResultCode code = CrossCall(ipc, IPC_NTOPENKEY_TAG, name, attributes,
root_directory, desired_access, &answer);
operator delete(name, NT_ALLOC);
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;
}
} 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;
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;
return CommonNtOpenKey(status, key, desired_access, object_attributes);
}
} // namespace sandbox
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