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我是WDD的初學者。我需要製作一個網絡驅動程序過濾器，根據簽名丟棄某些數據包，以保護系統免受程序漏洞攻擊。 現在，我只是想獲取我需要的數據包並找到我的簽名。我使用Metasploit Framework來利用此漏洞和Wireshark來跟蹤流量。在Wireshark的我看到4個數據包的目的端口8000是這樣的：丟失數據包（Windows NDIS驅動程序篩選器）
但是，當我試圖讓他們我只有2第一人 - 與SYN和ACK。
我的代碼基於NDIS driver filter sample。我正在編寫FilterReceiveNetBufferLists函數。下面的代碼：
_Use_decl_annotations_
VOID
FilterReceiveNetBufferLists(
NDIS_HANDLE FilterModuleContext,
PNET_BUFFER_LIST NetBufferLists,
NDIS_PORT_NUMBER PortNumber,
ULONG NumberOfNetBufferLists,
ULONG ReceiveFlags
)
/*++
Routine Description:
FilerReceiveNetBufferLists is an optional function for filter drivers.
If provided, this function processes receive indications made by underlying
NIC or lower level filter drivers. This function can also be called as a
result of loopback. If this handler is NULL, NDIS will skip calling this
filter when processing a receive indication and will call the next higher
driver in the stack. A filter that doesn't provide a
FilterReceiveNetBufferLists handler cannot provide a
FilterReturnNetBufferLists handler and cannot a initiate an original receive
indication on its own.
Arguments:
FilterModuleContext - our filter context area.
NetBufferLists - a linked list of NetBufferLists
PortNumber - Port on which the receive is indicated
ReceiveFlags -
N.B.: It is important to check the ReceiveFlags in NDIS_TEST_RECEIVE_CANNOT_PEND.
This controls whether the receive indication is an synchronous or
asynchronous function call.
--*/
{
PMS_FILTER pFilter = (PMS_FILTER)FilterModuleContext;
BOOLEAN DispatchLevel;
ULONG Ref;
BOOLEAN bFalse = FALSE;
#if DBG
ULONG ReturnFlags;
#endif
DEBUGP(DL_TRACE, "===>ReceiveNetBufferList: NetBufferLists = %p.\n", NetBufferLists);
do
{
DispatchLevel = NDIS_TEST_RECEIVE_AT_DISPATCH_LEVEL(ReceiveFlags);
#if DBG
FILTER_ACQUIRE_LOCK(&pFilter->Lock, DispatchLevel);
if (pFilter->State != FilterRunning)
{
FILTER_RELEASE_LOCK(&pFilter->Lock, DispatchLevel);
if (NDIS_TEST_RECEIVE_CAN_PEND(ReceiveFlags))
{
ReturnFlags = 0;
if (NDIS_TEST_RECEIVE_AT_DISPATCH_LEVEL(ReceiveFlags))
{
NDIS_SET_RETURN_FLAG(ReturnFlags, NDIS_RETURN_FLAGS_DISPATCH_LEVEL);
}
NdisFReturnNetBufferLists(pFilter->FilterHandle, NetBufferLists, ReturnFlags);
}
break;
}
FILTER_RELEASE_LOCK(&pFilter->Lock, DispatchLevel);
#endif
ASSERT(NumberOfNetBufferLists >= 1);
////////////////////////////// MY CODE //////////////////////////////////////
FILTER_ACQUIRE_LOCK(&pFilter->Lock, DispatchLevel);
PNET_BUFFER_LIST pCurrentNetBufferList = NetBufferLists;
PNET_BUFFER pCurrentNetBuffer = NET_BUFFER_LIST_FIRST_NB(pCurrentNetBufferList);
while (pCurrentNetBufferList)
{
while (pCurrentNetBuffer)
{
ULONG netbuffer_size = NET_BUFFER_DATA_LENGTH(pCurrentNetBuffer);
BYTE* buffer = (BYTE*)NdisGetDataBuffer(
pCurrentNetBuffer,
netbuffer_size,
NULL,
1,
0);
if (buffer) {
ParseBuffer(buffer, netbuffer_size);
}
else
{
void* alloc_mem = ExAllocatePoolWithTag(PagedPool, netbuffer_size, 'BteN');
buffer = (BYTE*)NdisGetDataBuffer(
pCurrentNetBuffer,
netbuffer_size,
alloc_mem,
1,
0);
if (buffer) {
ParseBuffer(buffer, netbuffer_size);
}
else {
DbgPrint("T.T");
}
ExFreePoolWithTag(alloc_mem, 'BteN');
}
pCurrentNetBuffer = NET_BUFFER_NEXT_NB(pCurrentNetBuffer);
}
pCurrentNetBufferList = NET_BUFFER_LIST_NEXT_NBL(pCurrentNetBufferList);
}
FILTER_RELEASE_LOCK(&pFilter->Lock, DispatchLevel);
////////////////////////////////////////////////////////////////////////////
//
// If you would like to drop a received packet, then you must carefully
// modify the NBL chain as follows:
//
// if NDIS_TEST_RECEIVE_CANNOT_PEND(ReceiveFlags):
// For each NBL that is NOT dropped, temporarily unlink it from
// the linked list, and indicate it up alone with
// NdisFIndicateReceiveNetBufferLists and the
// NDIS_RECEIVE_FLAGS_RESOURCES flag set. Then immediately
// relink the NBL back into the chain. When all NBLs have been
// indicated up, you may return from this function.
// otherwise (NDIS_TEST_RECEIVE_CANNOT_PEND is FALSE):
// Divide the linked list of NBLs into two chains: one chain
// of packets to drop, and everything else in another chain.
// Return the first chain with NdisFReturnNetBufferLists, and
// indicate up the rest with NdisFIndicateReceiveNetBufferLists.
//
// Note: on the receive path for Ethernet packets, one NBL will have
// exactly one NB. So (assuming you are receiving on Ethernet, or are
// attached above Native WiFi) you do not need to worry about dropping
// one NB, but trying to indicate up the remaining NBs on the same NBL.
// In other words, if the first NB should be dropped, drop the whole NBL.
//
//
// If you would like to modify a packet, and can do so quickly, you may
// do it here. However, make sure you save enough information to undo
// your modification in the FilterReturnNetBufferLists handler.
//
//
// If necessary, queue the NetBufferLists in a local structure for later
// processing. However, do not queue them for "too long", or else the
// system's performance may be degraded. If you need to hold onto an
// NBL for an unbounded amount of time, then allocate memory, perform a
// deep copy, and return the original NBL.
//
if (pFilter->TrackReceives)
{
FILTER_ACQUIRE_LOCK(&pFilter->Lock, DispatchLevel);
pFilter->OutstandingRcvs += NumberOfNetBufferLists;
Ref = pFilter->OutstandingRcvs;
FILTER_LOG_RCV_REF(1, pFilter, NetBufferLists, Ref);
FILTER_RELEASE_LOCK(&pFilter->Lock, DispatchLevel);
}
NdisFIndicateReceiveNetBufferLists(
pFilter->FilterHandle,
NetBufferLists,
PortNumber,
NumberOfNetBufferLists,
ReceiveFlags);
if (NDIS_TEST_RECEIVE_CANNOT_PEND(ReceiveFlags) &&
pFilter->TrackReceives)
{
FILTER_ACQUIRE_LOCK(&pFilter->Lock, DispatchLevel);
pFilter->OutstandingRcvs -= NumberOfNetBufferLists;
Ref = pFilter->OutstandingRcvs;
FILTER_LOG_RCV_REF(2, pFilter, NetBufferLists, Ref);
FILTER_RELEASE_LOCK(&pFilter->Lock, DispatchLevel);
}
} while (bFalse);
DEBUGP(DL_TRACE, "<===ReceiveNetBufferList: Flags = %8x.\n", ReceiveFlags);
}
ParseBuffer功能：
VOID ParseBuffer(BYTE *buffer, ULONG netbuffer_size)
{
// parse ethernet
eth_header_t* pEthHeader = (eth_header_t*)buffer;
ASSERT(pEthHeader);
if (pEthHeader->type == RtlUshortByteSwap(EtherType_IPv4))
{
// parse ipv4
ipv4_header_t* pIpHeader = (ipv4_header_t*)(buffer + sizeof(eth_header_t));
ASSERT(pIpHeader);
ASSERT(pIpHeader->version == IPPROTO_IPV4);
if (pIpHeader->protocol == IPPROTO_TCP)
{
// parse tcp
tcp_header_t* pTcpHeader = (tcp_header_t*)(buffer + sizeof(eth_header_t) + sizeof(ipv4_header_t));
ASSERT(pTcpHeader);
if (pTcpHeader->dst_port == RtlUshortByteSwap(8000))
{
if (netbuffer_size) {}
DbgPrint("PACKET DUMP:\n");
DbgPrintHexDump(buffer, netbuffer_size);
WORD ip_total_length = RtlUshortByteSwap(pIpHeader->total_length);
WORD tcp_size = ip_total_length - sizeof(ipv4_header_t);
WORD data_size = tcp_size - (pTcpHeader->data_offset << 2);
DbgPrint("DATA SIZE: %d \n", data_size);
// if there is any data in packet
if(data_size)
{
BYTE* data = (buffer + sizeof(eth_header_t) + sizeof(ipv4_header_t) + (pTcpHeader->data_offset << 2));
ASSERT(data);
DbgPrint("Data:\n");
DbgPrintHexDump(data, data_size);
const char* signature = "\xEB\x0C/HTTP/1.1 ";
const char* pch = strstr((const char*)data, signature);
if (pch != NULL)
{
DbgPrint("Got it!\n");
}
}
DbgPrint("\n");
}
}
}
}
也許我之前處理它們克隆NetBufferLists，我不知道。如果我必須，我應該什麼時候做？
P.S. The full code（如果您需要）。