0x0 成果展示
0x1 起因
0x2 准备的东西
0x3 驱动编写
0x4 Client编写
0x5 Python Web后端编写
0x6 结论
0x7 后记
0x0 成果展示
没有做日志记录因为时间关系。
我们假设恶意C2C服务器IP是220.181.38.148(百度的某个节点),某个木马的恶意流量特征是?? ?? ?? ??(? 匹配所有)
当我们要屏蔽220.181.38.148IP的时候 在我们后台输入这个IP地址就可以屏蔽了,当然这里只是展示了屏蔽功能,也可以做成给后台报警
这是没有增加规则的:
增加了规则:
数据包同理,这里的?? 代表匹配所有数据包。因此会把所有的数据包全部drop 掉
依然ping的通百度但是无法打开页面(因为数据包都被drop了。
当然你也可以选择记录这些IP和数据去后台进行报警通知.只要木马的流量特征库足够大,
这里说一下 很多DDOS防火墙也是这个道理,通过检测数据包的特征判断是否有DDOS攻击,一些AMP攻击的流量特征是固定的.
GitHub地址:https://github.com/huoji120/NetWatch
0x1 起因
本人是新手第一次接触驱动开发的小白,事情是这样的,一个星期前突发奇想想做一个威胁流量检测系统.于是就有了今天这篇文章。
0x2 准备的东西
做过防火墙的同学应该熟悉在windows下普遍使用WFP或者NDIS这两种驱动框架,这两种框架各有各的优点,我自己总结为:
NDIS够底层,能拦截所有的数据包和协议,而且兼容性好,覆盖系统全面.但是NDIS因为太底层,很多功能无法实现.而且很多功能实现的方法不是很友好
WFP够方便,Filte Engine很容易就能实现一个防火墙,简单快捷.而且可以很方便的得到发包进程的详细信息.但是不是很底层,依赖于tcpip.sys,如果某些东西自己写一个驱动去发包就无法抓取到.
NDIS防火墙安装会断网.这也是为什么诸如安全狗这类软件会断网的原因
不过考虑到我放弃了WIN2003系统,所以我选择了更加方便的WFP
WFP工作方式如图:
0x3 驱动编写
首先实现一个抓包demo:
R3部分建立pipe管道
enum ReportType
{
r_income, //进来auth
r_output, //出去auth
r_stream_income, //TCP流交互
r_stream_output
};
enum Protocoltype
{
Pro_ICMP = 1,
Pro_IGMP = 2,
Pro_TCP = 6,
Pro_UDP = 17,
Pro_RDP = 27,
Pro_UNKNOWN
};
struct Networkreport {
ReportType type;
Protocoltype Protocol;
DWORD IPaddr;
DWORD BuffDataLen;
char* BuffData;
};
std::string GetSigHex(char* data, int len)
{
char buf[0xFFFF] = { 0 };
for (int i = 0; i < len; i++)
{
char test[8] = { 0 };
if (i == len - 1)
{
sprintf_s(test, "%02X", (BYTE)data[i]);
strcat_s(buf, test);
}
else
{
sprintf_s(test, "%02X ", (BYTE)data[i]);
strcat_s(buf, test);
}
}
return std::string(buf);
}
int main()
{
HANDLE hPipe = CreateNamedPipe(
TEXT("\\\\.\\Pipe\\EzFireWall"),
PIPE_ACCESS_DUPLEX | FILE_FLAG_OVERLAPPED,
PIPE_TYPE_MESSAGE | PIPE_READMODE_MESSAGE | PIPE_WAIT,
PIPE_UNLIMITED_INSTANCES,
0,
0,
NMPWAIT_WAIT_FOREVER,
NULL);
if (INVALID_HANDLE_VALUE == hPipe)
return false;
std::cout << "创建管道完毕,监听程序...\n";
const int size = 1024 * 10;
char buf[size];
DWORD rlen = 0;
while (true)
{
if (ConnectNamedPipe(hPipe, NULL) != NULL)
{
if (ReadFile(hPipe, buf, size, &rlen, NULL) == FALSE)
continue;
else
{
//接收信息
Networkreport* buffer_tmp = (Networkreport*)&buf;
SIZE_T buffer_len = sizeof(Networkreport) + buffer_tmp->BuffDataLen;
Networkreport* buffer = (Networkreport*)malloc(buffer_len);
memcpy(buffer, buffer_tmp, buffer_len);
char* data = (char*)malloc(buffer->BuffDataLen);
BYTE* tmp = (BYTE*)buffer + sizeof(Networkreport);
memcpy(data, tmp, buffer->BuffDataLen);
DWORD RemoteIP = buffer->IPaddr;
printf("远程IP:%u.%u.%u.%u 协议类型: %d 数据类型: %d 长度: %d \n", (RemoteIP >> 24) & 0xFF, (RemoteIP >> 16) & 0xFF, (RemoteIP >> 8) & 0xFF, RemoteIP & 0xFF, buffer->Protocol, buffer->type, buffer->BuffDataLen);
if (buffer->type == r_stream_income || buffer->type == r_stream_output)
{
printf("数据: %s \n", GetSigHex(data,buffer->BuffDataLen).c_str());
}
free(data);
free(buffer);
}
}
}
std::cout << "出现错误 \n";
system("pause");
return 0;
}在驱动entry部分连接pipe管道:
HANDLE g_hClient;
IO_STATUS_BLOCK g_ioStatusBlock;
KEVENT g_event;
VOID ReportToR3(Networkreport* m_parameter,int lent)
{
if (!NT_SUCCESS(ZwWriteFile(g_hClient, NULL, NULL, NULL, &g_ioStatusBlock, (void*)m_parameter, lent, NULL, NULL)))
DPRINT("[DebugMessage] Error Cannot Wirte Pipe! \n"),
g_hClient = 0;
}
RtlInitUnicodeString(&uniName, L"\\DosDevices\\Pipe\\EzFireWall");
InitializeObjectAttributes(&objAttr, &uniName,OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE,NULL, NULL);
Status = ZwCreateFile(&g_hClient,
GENERIC_READ | GENERIC_WRITE,
&objAttr, &g_ioStatusBlock,
NULL,
FILE_ATTRIBUTE_NORMAL,
0,
FILE_OPEN,
FILE_SYNCHRONOUS_IO_NONALERT,
NULL, 0);
if (!NT_SUCCESS(Status) || !g_hClient)
{
DPRINT("[DebugMessage] Cannot pipe Fail! 0x%08X \n", Status);
return Status;
}
DPRINT("[DebugMessage] Connect pipe Success!\n");
KeInitializeEvent(&g_event, SynchronizationEvent, TRUE);然后WFP模板部分不单独发了,没什么好说的,重点说一下我们要挂钩的几个地方:
FWPM_LAYER_ALE_AUTH_CONNECT_V4、FWPM_LAYER_ALE_AUTH_RECV_ACCEPT_V4 分别对应链接认证阶段阶段,区别是一个是out一个是income
FWPM_LAYER_STREAM_V4 抓取数据流,用于流量信息监测
if (IsEqualGUID(layerKey, &FWPM_LAYER_ALE_AUTH_CONNECT_V4))
{
DPRINT("[DebugMessage] 挂载 FWPM_LAYER_ALE_AUTH_CONNECT_V4! \n");
sCallout.classifyFn = SFALEConnectClassify; //我们的回调
sCallout.notifyFn = SFALEConnectNotify;
}
else if (IsEqualGUID(layerKey, &FWPM_LAYER_ALE_AUTH_RECV_ACCEPT_V4))
{
DPRINT("[DebugMessage] 挂载 FWPM_LAYER_ALE_AUTH_RECV_ACCEPT_V4! \n");
sCallout.classifyFn = SFALERecvAcceptClassify; //我们的回调
sCallout.notifyFn = SFALERecvAcceptNotify;
}
else if (IsEqualGUID(layerKey, &FWPM_LAYER_STREAM_V4))
{
DPRINT("[DebugMessage] 挂载 FWPM_LAYER_STREAM_V4! \n");
sCallout.classifyFn = SFALERecvDataClassify; //我们的回调
sCallout.notifyFn = SFALERecvDataNotify;
}
Status = FwpsCalloutRegister0(DeviceObject,
&sCallout,
calloutId);
其中 值得一提的是FWPM_LAYER_ALE_CONNECT_REDIRECT_V4,可以改变连接的地址,实现偷梁换柱功能.非常适合拿去干坏事.不过不在本次的讨论范围内
在SFALEConnectClassify和SFALERecvAcceptClassify回调中,负责屏蔽黑名单IP,这部分稍微抄了一下前辈的代码:
//本地连别人的IP的连接
void SFALEConnectClassify(
__in const FWPS_INCOMING_VALUES0* inFixedValues,
__in const FWPS_INCOMING_METADATA_VALUES0* inMetaValues,
__inout void* layerData,
__in const FWPS_FILTER0* filter,
__in UINT64 flowContext,
__in FWPS_CLASSIFY_OUT0* classifyOut
)
{
if (classifyOut->rights & FWPS_RIGHT_ACTION_WRITE)
{
FWP_ACTION_TYPE Action = (CanIFilterThisRequest(inFixedValues,inMetaValues, layerData,flowContext) ? FWP_ACTION_BLOCK : FWP_ACTION_PERMIT);
PerformBasicAction(inFixedValues,
inMetaValues,
layerData,
filter,
flowContext,
classifyOut,
Action);
}
}
//接收远程IP的连接
void SFALERecvAcceptClassify(
__in const FWPS_INCOMING_VALUES0* inFixedValues,
__in const FWPS_INCOMING_METADATA_VALUES0* inMetaValues,
__inout void* layerData,
__in const FWPS_FILTER0* filter,
__in UINT64 flowContext,
__inout FWPS_CLASSIFY_OUT0* classifyOut
)
{
if (classifyOut->rights & FWPS_RIGHT_ACTION_WRITE)
{
FWP_ACTION_TYPE Action = (CanIFilterThisRequest(inFixedValues,inMetaValues, layerData, flowContext) ? FWP_ACTION_BLOCK : FWP_ACTION_PERMIT);
PerformBasicAction(inFixedValues,
inMetaValues,
layerData,
filter,
flowContext,
classifyOut,
Action);
}
}
FWPM_LAYER_ALE_AUTH_RECV_ACCEPT_V4 这里是我之前代码,有个小bug,至于是什么bug大佬应该一眼看出来了:
void SFALERecvDataClassify(
__in const FWPS_INCOMING_VALUES0* inFixedValues,
__in const FWPS_INCOMING_METADATA_VALUES0* inMetaValues,
__inout void* layerData,//这玩意是数据指针
__in const FWPS_FILTER0* filter,
__in UINT64 flowContext,
__inout FWPS_CLASSIFY_OUT0* classifyOut
)
{
if (KeGetCurrentIrql() > DISPATCH_LEVEL)
{
DPRINT("[DebugMessage] Erro in PassIve: %d \n", KeGetCurrentIrql());
return FALSE;
}
FWPS_STREAM_CALLOUT_IO_PACKET* streamPacket = (FWPS_STREAM_CALLOUT_IO_PACKET*)layerData;
DWORD RemoteIP = inFixedValues->incomingValue[FWPS_FIELD_ALE_AUTH_CONNECT_V4_IP_REMOTE_ADDRESS].value.uint32;
DWORD LocalIP = inFixedValues->incomingValue[FWPS_FIELD_ALE_AUTH_CONNECT_V4_IP_LOCAL_ADDRESS].value.uint32;
if (streamPacket && streamPacket->streamData != NULL && streamPacket->streamData->dataLength != 0 && RemoteIP != LocalIP && g_StartFilter)
{
SIZE_T streamLength = streamPacket->streamData->dataLength;
BOOLEAN inbound = (BOOLEAN)((streamPacket->streamData->flags & FWPS_STREAM_FLAG_RECEIVE) == FWPS_STREAM_FLAG_RECEIVE);
BYTE* stream = ExAllocatePoolWithTag(NonPagedPool, streamLength, TAG_NAME_NOTIFY);
SIZE_T byte_copied = 0;
if (stream)
{
RtlZeroMemory(stream, streamLength);
FwpsCopyStreamDataToBuffer(
streamPacket->streamData,
stream,
streamLength,
&byte_copied);
NT_ASSERT(bytesCopied == streamLength);
DPRINT("[DebugMessage] inbound: %d streamBuffer: %s ", inbound, stream);
SIZE_T buffsize = streamLength + sizeof(Networkreport);
inbound = (BOOLEAN)((streamPacket->streamData->flags & FWPS_STREAM_FLAG_RECEIVE) == FWPS_STREAM_FLAG_RECEIVE);
Networkreport* report = (Networkreport*)ExAllocatePoolWithTag(NonPagedPool, buffsize, TAG_NAME_REPORT);
if (report)
{
RtlZeroMemory(report, buffsize);
report->type = inbound ? r_stream_income : r_stream_output;
report->Protocol = inFixedValues->incomingValue[FWPS_FIELD_ALE_AUTH_CONNECT_V4_IP_PROTOCOL].value.uint16;
report->IPaddr = RemoteIP;
report->BuffDataLen = streamLength;
//定位到buffer的sizeof(Networkreport)位置
BYTE* tmp = (BYTE*)report + sizeof(Networkreport);
memcpy(tmp, stream, streamLength);
ReportToR3(report, buffsize);
ExFreePool(report);
}
ExFreePool(stream);
}
}
classifyOut->actionType = FWP_ACTION_CONTINUE;
}
结果:
好的可以抓包了就可以开始进行下一步过滤了:
首先是提交过滤的程序,这里偷懒了:
//添加数据到 到黑名单数据列表
VOID AddBlackListData(char* data,DWORD blockip,SIZE_T len)
{
if (blockip == 0x0)
{
DPRINT("[DebugMessage] BlackData :%s len: %d \n", data, len);
PBLACK_LIST_DATA newLink = (PBLACK_LIST_DATA)ExAllocatePoolWithTag(PagedPool, sizeof(BLACK_LIST_DATA), TAG_NAME_BLACKLISTDATA);
if (newLink == NULL)
ASSERT(false);
//RtlZeroMemory(newLink, sizeof(BLACK_LIST_DATA));
memcpy(newLink->data, data, len);
DPRINT("[DebugMessage] BlackData :%s \n", newLink->data);
InsertTailList(&gBackListDataTable.link, (PLIST_ENTRY)newLink);
}
else
{
for (int i = 0; i < MAX_DATA_SIZE; i++)
{
if (gBackListIPTable[i] == 0)
{
gBackListIPTable[i] = blockip;
DPRINT("[DebugMessage] BlackIP :0x%08X \n", gBackListIPTable[i]);
break;
}
}
}
}
控制码:
NTSTATUS DriverControlHandler(
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp)
{
PIO_STACK_LOCATION irpSp;// Pointer to current stack location
NTSTATUS ntStatus = STATUS_UNSUCCESSFUL;// Assume success
ULONG inBufLength; // Input buffer length
ULONG outBufLength; // Output buffer length
PUCHAR inBuf, outBuf;
UNREFERENCED_PARAMETER(DeviceObject);
irpSp = IoGetCurrentIrpStackLocation(Irp);
inBufLength = irpSp->Parameters.DeviceIoControl.InputBufferLength;
outBufLength = irpSp->Parameters.DeviceIoControl.OutputBufferLength;
inBuf = (PUCHAR)Irp->AssociatedIrp.SystemBuffer;
outBuf = (PUCHAR)Irp->AssociatedIrp.SystemBuffer;
DPRINT("[DebugMessage] DriverControlHandler: inBufLength: %d outBufLength: %d \n", inBufLength, outBufLength);
if (!inBufLength || !outBufLength)
{
ntStatus = STATUS_INVALID_PARAMETER;
goto End;
}
switch (irpSp->Parameters.DeviceIoControl.IoControlCode)
{
case IOCTL_ADD_BLACKLIST_DATA:
{
DPRINT("[DebugMessage] Add BlackList Data! \n");
PPUSH_DATA push_data = (PPUSH_DATA)ExAllocatePoolWithTag(PagedPool, sizeof(PUSH_DATA), "tM2d");
if (push_data)
{
RtlZeroMemory(push_data, sizeof(PUSH_DATA));
memcpy(push_data, inBuf, inBufLength);
AddBlackListData(push_data->data, push_data->BlockIP, push_data->dataLen);
DPRINT("[DebugMessage] BlockIP: 0x%08X data: %s len: %d \n", push_data->BlockIP, push_data->data, push_data->dataLen);
g_StartFilter = TRUE;
ntStatus = STATUS_SUCCESS;
ExFreePoolWithTag(push_data, "tM2d");
}
else
{
ntStatus = STATUS_INVALID_PARAMETER;
}
break;
}
default:
break;
}
End:
Irp->IoStatus.Status = ntStatus;
Irp->IoStatus.Information = 0;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return ntStatus;
}
黑名单IP匹配:
//黑名单IP匹配
BOOLEAN QueryBlackIP(DWORD ipaddr)
{
KIRQL Irql = ExAcquireSpinLockExclusive(&gBlockIpLock);
BOOLEAN result = FALSE;
for (int i = 0; i < MAX_DATA_SIZE; i++)
{
if (gBackListIPTable[i] == ipaddr)
{
result = TRUE;
break;
}
}
ExReleaseSpinLockExclusive(&gBlockIpLock, Irql);
return result;
}
之后在SFALEConnectClassify和SFALERecvAcceptClassify的地方进行验证:
BOOLEAN CanIFilterThisRequest(
__in const FWPS_INCOMING_VALUES0* inFixedValues,
__in const FWPS_INCOMING_METADATA_VALUES0* inMetaValues,
__in void* packet,
_In_ UINT64 flowContext
)
{
UNREFERENCED_PARAMETER(inMetaValues);
if (KeGetCurrentIrql() > DISPATCH_LEVEL)
{
DPRINT("[DebugMessage] Erro in PassIve: %d \n", KeGetCurrentIrql());
return FALSE;
}
if (g_StartFilter)
{
DWORD LocalIp = inFixedValues->incomingValue[FWPS_FIELD_ALE_AUTH_CONNECT_V4_IP_LOCAL_ADDRESS].value.uint32;
DWORD RemoteIP = inFixedValues->incomingValue[FWPS_FIELD_ALE_AUTH_CONNECT_V4_IP_REMOTE_ADDRESS].value.uint32;
if (LocalIp != RemoteIP)
{
if (QueryBlackIP(RemoteIP))
{
DPRINT("[DebugMessage] Found BlackList IP! \n");
return TRUE;
}
}
}
//这边可以阻止黑名单IP进入.
/*
char* ProtocolName = ProtocolIdToName(inFixedValues->incomingValue[FWPS_FIELD_ALE_AUTH_CONNECT_V4_IP_PROTOCOL].value.uint16);
DWORD LocalIp = inFixedValues->incomingValue[FWPS_FIELD_ALE_AUTH_CONNECT_V4_IP_LOCAL_ADDRESS].value.uint32;
DWORD RemoteIP = inFixedValues->incomingValue[FWPS_FIELD_ALE_AUTH_CONNECT_V4_IP_REMOTE_ADDRESS].value.uint32;
DPRINT("[DebugMessage] Out: ProtocolName: %s Local: %u.%u.%u.%u:%d Remote:%u.%u.%u.%u:%d Protocol: %s \n",
(LocalIp >> 24) & 0xFF, (LocalIp >> 16) & 0xFF, (LocalIp >> 8) & 0xFF, LocalIp & 0xFF,
inFixedValues->incomingValue[FWPS_FIELD_ALE_AUTH_CONNECT_V4_IP_LOCAL_PORT].value.uint16,
(RemoteIP >> 24) & 0xFF, (RemoteIP >> 16) & 0xFF, (RemoteIP >> 8) & 0xFF, RemoteIP & 0xFF,
inFixedValues->incomingValue[FWPS_FIELD_ALE_AUTH_CONNECT_V4_IP_REMOTE_PORT].value.uint16,
ProtocolName);
ExFreePool(ProtocolName);
*/
return FALSE;
}
CanIFilterThisRequest 返回TRUE后 在SFALEConnectClassify和SFALERecvAcceptClassify中阻止链接:
FWP_ACTION_TYPE Action = (CanIFilterThisRequest(inFixedValues,inMetaValues, layerData,flowContext) ? FWP_ACTION_BLOCK : FWP_ACTION_PERMIT);
PerformBasicAction(inFixedValues,inMetaValues,layerData,filter,flowContext,classifyOut,Action);
然后是数据包过滤:
//黑名单数据匹配
BOOLEAN QueryBlackListData(char* data, SIZE_T len)
{
KIRQL Irql = ExAcquireSpinLockExclusive(&gBlockDataLock);
BOOLEAN result = FALSE;
PLIST_ENTRY head = &gBackListDataTable.link;
PBLACK_LIST_DATA next = (PBLACK_LIST_DATA)gBackListDataTable.link.Blink;
while (head != (PLIST_ENTRY)next)
{
if(FindPattern(next->data, data, len))
{
result = TRUE;
break;
}
}
ExReleaseSpinLockExclusive(&gBlockDataLock, Irql);
return result;
}
void SFALERecvDataClassify(
__in const FWPS_INCOMING_VALUES0* inFixedValues,
__in const FWPS_INCOMING_METADATA_VALUES0* inMetaValues,
__inout void* layerData,//这玩意是数据指针
__in const FWPS_FILTER0* filter,
__in UINT64 flowContext,
__inout FWPS_CLASSIFY_OUT0* classifyOut
)
{
if (KeGetCurrentIrql() > DISPATCH_LEVEL)
{
DPRINT("[DebugMessage] Erro in PassIve: %d \n", KeGetCurrentIrql());
return FALSE;
}
FWPS_STREAM_CALLOUT_IO_PACKET* streamPacket = (FWPS_STREAM_CALLOUT_IO_PACKET*)layerData;
DWORD RemoteIP = inFixedValues->incomingValue[FWPS_FIELD_ALE_AUTH_CONNECT_V4_IP_REMOTE_ADDRESS].value.uint32;
DWORD LocalIP = inFixedValues->incomingValue[FWPS_FIELD_ALE_AUTH_CONNECT_V4_IP_LOCAL_ADDRESS].value.uint32;
if (streamPacket && streamPacket->streamData != NULL && streamPacket->streamData->dataLength != 0 && RemoteIP != LocalIP && g_StartFilter)
{
SIZE_T streamLength = streamPacket->streamData->dataLength;
BOOLEAN inbound = (BOOLEAN)((streamPacket->streamData->flags & FWPS_STREAM_FLAG_RECEIVE) == FWPS_STREAM_FLAG_RECEIVE);
BYTE* stream = ExAllocatePoolWithTag(NonPagedPool, streamLength, TAG_NAME_NOTIFY);
SIZE_T byte_copied = 0;
if (stream)
{
RtlZeroMemory(stream, streamLength);
FwpsCopyStreamDataToBuffer(
streamPacket->streamData,
stream,
streamLength,
&byte_copied);
NT_ASSERT(bytesCopied == streamLength);
if (QueryBlackListData(stream, streamLength))
{
DPRINT("[DebugMessage] Found BlackList Data! \n");
classifyOut->actionType = FWP_ACTION_BLOCK;
ExFreePool(stream);
return;
}
/*
//抓包与截包,如果你发现这里蓝屏请自己加锁,但是会极大的影响系统运行效率(网络吞吐量太大,pipe管道有20MS的延迟,而且还是单线程.伤不起
DPRINT("[DebugMessage] inbound: %d streamBuffer: %s ", inbound, stream);
SIZE_T buffsize = streamLength + sizeof(Networkreport);
inbound = (BOOLEAN)((streamPacket->streamData->flags & FWPS_STREAM_FLAG_RECEIVE) == FWPS_STREAM_FLAG_RECEIVE);
Networkreport* report = (Networkreport*)ExAllocatePoolWithTag(NonPagedPool, buffsize, TAG_NAME_REPORT);
if (report)
{
RtlZeroMemory(report, buffsize);
report->type = inbound ? r_stream_income : r_stream_output;
report->Protocol = inFixedValues->incomingValue[FWPS_FIELD_ALE_AUTH_CONNECT_V4_IP_PROTOCOL].value.uint16;
report->IPaddr = RemoteIP;
report->BuffDataLen = streamLength;
//定位到buffer的sizeof(Networkreport)位置
BYTE* tmp = (BYTE*)report + sizeof(Networkreport);
memcpy(tmp, stream, streamLength);
ReportToR3(report, buffsize);
ExFreePool(report);
}*/
ExFreePool(stream);
}
}
classifyOut->actionType = FWP_ACTION_CONTINUE;
}
匹配成功后 classifyOut->actionType = FWP_ACTION_BLOCK; 则丢掉这个数据包
匹配函数FindPattern
BOOL FindPattern(char* pattern,void* data,SIZE_T data_len)
{
const char* pat = pattern;
DWORD firstMatch = 0;
DWORD End = (DWORD)data + data_len;
for (DWORD pCur = (DWORD)data; pCur < End; pCur++)
{
if (!*pat)
return firstMatch;
if (*(PBYTE)pat == '\?' || *(BYTE*)pCur == getByte(pat))
{
if (!firstMatch)
firstMatch = pCur;
if (!pat[2])
return firstMatch;
if (*(PWORD)pat == '\?\?' || *(PBYTE)pat != '\?')
pat += 3;
else
pat += 2; //one ?
}
else
{
pat = pattern;
firstMatch = 0;
}
}
return firstMatch != NULL;
}
至此.驱动部分编写完毕.
0x4 Client编写
这里有个失误,不应该使用Client作为TCP服务端,应该是Python来做服务端,无所谓了.先能用再说:
#define IOCTL_ADD_BLACKLIST_DATA \
CTL_CODE(FILE_DEVICE_UNKNOWN, 0x1337, METHOD_IN_DIRECT, FILE_ANY_ACCESS)
typedef NTSTATUS(WINAPI* NtOpenFileEx)(
_Out_ PHANDLE FileHandle,
_In_ ACCESS_MASK DesiredAccess,
_In_ POBJECT_ATTRIBUTES ObjectAttributes,
_Out_ PIO_STATUS_BLOCK IoStatusBlock,
_In_ ULONG ShareAccess,
_In_ ULONG OpenOptions
);
struct Networkstruct {
int data_len;
DWORD IP;
char data[255];
};
typedef struct _PUSH_DATA {
DWORD BlockIP;
SIZE_T dataLen;
char data[255];
}PUSH_DATA, * PPUSH_DATA;
NtOpenFileEx fpNtOpenFile = (NtOpenFileEx)GetProcAddress(GetModuleHandleA("ntdll"), "NtOpenFile");
HANDLE deviceHandle_;
bool is_loaded()
{
if (!deviceHandle_ || deviceHandle_ == INVALID_HANDLE_VALUE) {
//deviceHandle_ = CreateFile(L"C:\\windows\\TEMP\\cpuz147\\cpuz145_x64.sys", FILE_ALL_ACCESS, FILE_SHARE_READ, nullptr, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, nullptr);
IO_STATUS_BLOCK io_status;
NTSTATUS status;
UNICODE_STRING device_name = UNICODE_STRING{ sizeof(DEVICE_NAME) - sizeof(WCHAR), sizeof(DEVICE_NAME), (PWSTR)DEVICE_NAME };
OBJECT_ATTRIBUTES obj_attr = OBJECT_ATTRIBUTES{ sizeof(OBJECT_ATTRIBUTES), nullptr, &device_name, 0, nullptr, nullptr };
status = fpNtOpenFile(
&deviceHandle_, GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE,
&obj_attr, &io_status, 0, OPEN_EXISTING);
if (!NT_SUCCESS(status)) {
ULONG i = 10;
do {
status = fpNtOpenFile(
&deviceHandle_, GENERIC_READ | GENERIC_WRITE | SYNCHRONIZE,
&obj_attr, &io_status, 0, OPEN_EXISTING);
Sleep(250);
} while (!NT_SUCCESS(status) && i--);
}
}
return deviceHandle_ && deviceHandle_ != INVALID_HANDLE_VALUE;
}
int main()
{
if (!is_loaded())
{
printf("加载驱动失败! %d \n", GetLastError());
system("pause");
return 0;
}
WSADATA wsaData;
SOCKET ClientSocket;
int port = 5099;
if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0)
{
return false;
}
SOCKET sockSrv = socket(AF_INET, SOCK_STREAM, 0);
SOCKADDR_IN addrSrv;
addrSrv.sin_family = AF_INET;
addrSrv.sin_port = htons(port); //1024以上的端口号
addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
int retVal = bind(sockSrv, (LPSOCKADDR)&addrSrv, sizeof(SOCKADDR_IN));
if (retVal == SOCKET_ERROR) {
return false;
}
if (listen(sockSrv, 10) == SOCKET_ERROR) {
return false;
}
SOCKADDR_IN addrClient;
int len = sizeof(SOCKADDR);
static bool first = false;
ClientSocket = accept(sockSrv, (SOCKADDR*)&addrClient, &len);
if (ClientSocket == SOCKET_ERROR) {
return false;
}
while (true)
{
char recvBuf[255];
memset(recvBuf, 0, sizeof(recvBuf));
if (recv(ClientSocket, recvBuf, sizeof(recvBuf), 0) == 0 || ClientSocket == INVALID_SOCKET)
{
first = false;
closesocket(ClientSocket);
ClientSocket = accept(sockSrv, (SOCKADDR*)&addrClient, &len);
continue;
}
Networkstruct* buffer = (Networkstruct*)recvBuf;
//1说明是ip 2说明是data
char output;
DWORD returnLen, read;
PUSH_DATA data = { 0 };
data.BlockIP = buffer->IP;
data.dataLen = buffer->data_len;
printf("buffer->data %s \n", buffer->data);
memcpy(data.data, buffer->data,buffer->data_len);
printf("buffer len: %d data: %s IP: 0x%08X\n", data.dataLen, data.data, data.BlockIP);
if (!DeviceIoControl(deviceHandle_,
IOCTL_ADD_BLACKLIST_DATA,
(LPVOID)&data,
sizeof(PUSH_DATA),
&output,
sizeof(char),
&returnLen,
NULL))
{
printf("DeviceIoControl错误: %d\n", GetLastError());
}
else
{
printf("提交规则成功 \n");
}
closesocket(ClientSocket);
ClientSocket = accept(sockSrv, (SOCKADDR*)&addrClient, &len);
}
closesocket(sockSrv);
WSACleanup();
system("pause");
return 0;
}
0x5 Python web后台编写
非常简单的代码,基于Flask和Jquery与semanticUI
from flask import Flask, request
from flask import render_template
from binascii import hexlify
from socket import inet_aton, socket, AF_INET, SOCK_STREAM
import ctypes
import json
import struct
import sys
app = Flask(__name__)
ip_blacklist = [{'data': '192.168.1.1', 'text': '测试路由器地址(此规则不会生效)'}]
data_blacklist = [{'data': '?? ?? ?? ??', 'text': '拦截全部流量(此规则不会生效)'}]
HOST = 'localhost'
PORT = 5099
BUFSIZ = 255
ADDR = (HOST, PORT)
def push_backlist_data(data, data_len, block_ip, push_type):
if push_type == 1:
data = "huoji"
data_len = len(data)
c = socket(AF_INET, SOCK_STREAM)
c.connect(ADDR)
packet = struct.pack("IL255s",
data_len,
int(block_ip),
data.encode('gbk'),
)
c.send(packet)
c.close()
def Ip2Int(ipaddr):
int_ip = struct.unpack('!I', inet_aton(ipaddr))[0]
print('IP:' + str(int_ip))
return int_ip
@app.route('/')
def index():
context = ip_blacklist
context_type = {
'table_type1': "IP地址",
'table_type2': "备注"
}
return render_template('index.html', main=context, type=context_type)
@app.route('/api', methods=["POST", "GET"])
def api():
if request.method == 'POST':
data = request.form.get("data")
page = request.form.get("page")
push = request.form.get("push")
push_data = request.form.get("push_data")
if data:
# push_backlist_data(data, len(data))
return json.dumps({"status": "success"})
if page:
json_return = {"status": "Error"}
if int(page) == 1:
json_return = {
"status": "success",
"page": "ip_list",
"table_1": "IP地址",
"table_2": "备注",
"data": ip_blacklist
}
if int(page) == 2:
json_return = {
"status": "success",
"page": "data_list",
"table_1": "特征码",
"table_2": "备注",
"data": data_blacklist
}
return json.dumps(json_return)
if push and push_data:
json_return = {"status": "Error"}
processdata = push_data.split("@")
if int(push) == 1:
ip_blacklist.append({
"data": processdata[0],
"text": processdata[1]
})
else:
data_blacklist.append({
"data": processdata[0],
"text": processdata[1]
})
blockip = 0
if int(push) == 1:
blockip = Ip2Int(processdata[0])
print("type " + push + " blockip: " + str(blockip))
push_backlist_data(
processdata[0],
len(processdata[0]),
blockip,
int(push)
)
return json.dumps(json_return)
return "API"
if __name__ == '__main__':
app.run(debug=True)
0x6 结论
在前人无数的踩坑文章下诞生的没有的东西
0x7 后记
当今的安全企业很多都是在蹭政策(AkA 等保测评)去卖自家的产品赚钱,但自家的产品多半是从其他地方购买的东西或者是直接从github下载改造的东西.而且安全这个行业处于一个尴尬的地位,高压政策让进来的门槛变高,人员缺少,很多人觉得搞安全 = 搞黑客,去报培训班”培训” ,加上安全中的渗透这一块入门门槛和其他编程语言相比和java差不多,而渗透的水平只在于是否花更多时间积累更多经验.这些因素导致整个安全行业水分很大.有搞安全的公司领导根本不懂安全的、有安全公司直接拿开源产品改编然后去卖给甲方的.有整个公司就一个会搞安全的其他都是蹭饭的.这个时代的人们很浮躁,已经没有多少人可以像以前的人们一样能静下心来研究技术了.而是乐于给自己打上标签然后止步于这些自己立下的标签之下.
*本文原创作者：huoji120，本文属于FreeBuf原创奖励计划，未经许可禁止转载
来源：freebuf.com 2019-12-02 14:30:08 by: huoji120
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