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////////////////////////////////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2014 Microsoft Corporation. All Rights Reserved.
//
// Module Name:
// Scenarios_FastStreamInjection.cpp
//
// Abstract:
// This module contains functions which implements the FAST_STREAM_INJECTION scenarios.
//
// Naming Convention:
//
// <Scope><Object><Action><Modifier>
// <Scope><Object><Action>
//
// i.e.
//
// <Scope>
// {
// - Function is likely visible to other modules
// Prv - Function is private to this module.
// }
// <Object>
// {
// ScenarioFastStreamInjection - Function pertains to all of the Fast Stream Injection
// Scenarios
// RPC - Function is and RPC entry point.
// }
// <Action>
// {
// Add - Function adds objects
// Remove - Function removes objects
// Invoke - Function implements the scenario based on parameters
// passed from the commandline interface
// (WFPSampler.exe).
// }
// <Modifier>
// {
// FwpmObjects - Function acts on WFP objects.
// ScenarioFastStreamInjection - Function pertains to all of the Fast Stream Injection
// Scenarios
// }
//
// Private Functions:
// PrvScenarioFastStreamInjectionAddFwpmObjects(),
// PrvScenarioFastStreamInjectionDeleteFwpmObjects(),
// ScenarioFastStreamInjectionAdd(),
// ScenarioFastStreamInjectionRemove(),
//
// Public Functions:
// RPCInvokeScenarioFastStreamInjection(),
//
// Author:
// Dusty Harper (DHarper)
//
// Revision History:
//
// [ Month ][Day] [Year] - [Revision]-[ Comments ]
// May 01, 2010 - 1.0 - Creation
// December 13, 2013 - 1.1 - Prune filters for enumeration and limit scenario to
// only the supported layers
//
////////////////////////////////////////////////////////////////////////////////////////////////////
#include "Framework_WFPSamplerService.h" /// .
/**
@private_function="PrvScenarioFastStreamInjectionDeleteFwpmObjects"
Purpose: Function that disables the SCENARIO_FAST_STREAM_INJECTION scenarios. <br>
<br>
Notes: Scenario removes the filters using specified filtering conditions at the specified
layer. Associated callouts are removed as well. <br>
<br>
MSDN_Ref: <br>
*/
_Success_(return == NO_ERROR)
UINT32 PrvScenarioFastStreamInjectionDeleteFwpmObjects(_In_ const FWPM_FILTER* pFilter)
{
ASSERT(pFilter);
UINT32 status = NO_ERROR;
HANDLE engineHandle = 0;
HANDLE enumHandle = 0;
UINT32 entryCount = 0;
FWPM_FILTER** ppFilters = 0;
FWPM_FILTER_CONDITION* pFilterConditions = 0;
UINT32 numFilterConditions = 0;
FWPM_FILTER_ENUM_TEMPLATE filterEnumTemplate = {0};
GUID calloutKey = {0};
HlprFwpmFilterConditionPrune(pFilter->filterCondition,
pFilter->numFilterConditions,
&pFilterConditions,
&numFilterConditions);
calloutKey = WFPSAMPLER_CALLOUT_FAST_STREAM_INJECTION;
calloutKey.Data4[7] = HlprFwpmLayerGetIDByKey(&(pFilter->layerKey)); /// Uniquely identifies the callout used
filterEnumTemplate.providerKey = (GUID*)&WFPSAMPLER_PROVIDER;
filterEnumTemplate.layerKey = pFilter->layerKey;
filterEnumTemplate.enumType = FWP_FILTER_ENUM_FULLY_CONTAINED;
filterEnumTemplate.flags = FWP_FILTER_ENUM_FLAG_INCLUDE_BOOTTIME |
FWP_FILTER_ENUM_FLAG_INCLUDE_DISABLED;
filterEnumTemplate.numFilterConditions = pFilterConditions ? numFilterConditions : pFilter->numFilterConditions;
filterEnumTemplate.filterCondition = pFilterConditions ? pFilterConditions : pFilter->filterCondition;
filterEnumTemplate.actionMask = FWP_ACTION_FLAG_CALLOUT;
filterEnumTemplate.calloutKey = &calloutKey;
status = HlprFwpmEngineOpen(&engineHandle);
HLPR_BAIL_ON_FAILURE(status);
status = HlprFwpmFilterCreateEnumHandle(engineHandle,
&filterEnumTemplate,
&enumHandle);
HLPR_BAIL_ON_FAILURE(status);
status = HlprFwpmFilterEnum(engineHandle,
enumHandle,
0xFFFFFFFF,
&ppFilters,
&entryCount);
HLPR_BAIL_ON_FAILURE(status);
if(ppFilters)
{
for(UINT32 filterIndex = 0;
filterIndex < entryCount;
filterIndex++)
{
HlprFwpmFilterDeleteByKey(engineHandle,
&(ppFilters[filterIndex]->filterKey));
HlprFwpmCalloutDeleteByKey(engineHandle,
&(ppFilters[filterIndex]->action.calloutKey));
}
FwpmFreeMemory((VOID**)&ppFilters);
}
HLPR_BAIL_LABEL:
if(engineHandle)
{
if(enumHandle)
HlprFwpmFilterDestroyEnumHandle(engineHandle,
&enumHandle);
HlprFwpmEngineClose(&engineHandle);
}
HLPR_DELETE_ARRAY(pFilterConditions);
return status;
}
/**
@private_function="PrvScenarioFastStreamInjectionAddFwpmObjects"
Purpose: Function that enables the SCENARIO_FAST_STREAM_INJECTION scenarios. <br>
<br>
Notes: Scenario adds a filter using specified filtering conditions to the specified layer.
This filter is associated with WFPSampler's default sublayer and provider. The
appropriate callout is then added and associated with the filter. <br>
<br>
MSDN_Ref: <br>
*/
_Success_(return == NO_ERROR)
UINT32 PrvScenarioFastStreamInjectionAddFwpmObjects(_In_ const FWPM_FILTER* pFilter)
{
ASSERT(pFilter);
UINT32 status = NO_ERROR;
if(pFilter->layerKey == FWPM_LAYER_STREAM_V4 ||
pFilter->layerKey == FWPM_LAYER_STREAM_V6)
{
HANDLE engineHandle = 0;
FWPM_CALLOUT callout = {0};
FWPM_FILTER filter = {0};
RtlCopyMemory(&filter,
pFilter,
sizeof(FWPM_FILTER));
callout.calloutKey = WFPSAMPLER_CALLOUT_FAST_STREAM_INJECTION;
callout.calloutKey.Data4[7] = HlprFwpmLayerGetIDByKey(&(filter.layerKey)); /// Uniquely identifies the callout used
callout.displayData.name = L"WFPSampler's Fast Stream Injection Callout";
callout.displayData.description = L"Causes callout invocation which blindly injects data back into the stream";
callout.providerKey = (GUID*)&WFPSAMPLER_PROVIDER;
callout.applicableLayer = filter.layerKey;
status = HlprGUIDPopulate(&(filter.filterKey));
HLPR_BAIL_ON_FAILURE(status);
filter.providerKey = (GUID*)&WFPSAMPLER_PROVIDER;
filter.weight.type = FWP_UINT8;
filter.weight.uint8 = 0xF;
filter.action.type = FWP_ACTION_CALLOUT_TERMINATING;
filter.action.calloutKey = callout.calloutKey;
if(filter.flags & FWPM_FILTER_FLAG_BOOTTIME ||
filter.flags & FWPM_FILTER_FLAG_PERSISTENT)
callout.flags = FWPM_CALLOUT_FLAG_PERSISTENT;
status = HlprFwpmEngineOpen(&engineHandle);
HLPR_BAIL_ON_FAILURE(status);
status = HlprFwpmTransactionBegin(engineHandle);
HLPR_BAIL_ON_FAILURE(status);
status = HlprFwpmCalloutAdd(engineHandle,
&callout);
HLPR_BAIL_ON_FAILURE(status);
status = HlprFwpmFilterAdd(engineHandle,
&filter);
HLPR_BAIL_ON_FAILURE(status);
status = HlprFwpmTransactionCommit(engineHandle);
HLPR_BAIL_ON_FAILURE(status);
HLPR_BAIL_LABEL:
if(engineHandle)
{
if(status != NO_ERROR)
HlprFwpmTransactionAbort(engineHandle);
HlprFwpmEngineClose(&engineHandle);
}
}
else
status = (UINT32) FWP_E_INCOMPATIBLE_LAYER;
return status;
}
/**
@scenario_function="ScenarioFastStreamInjectionRemove"
Purpose: Function that removes corresponding objects for a previously added
SCENARIO_FAST_STREAM_INJECTION. <br>
<br>
Notes: <br>
<br>
MSDN_Ref: <br>
*/
_Success_(return == NO_ERROR)
UINT32 ScenarioFastStreamInjectionRemove(_In_ const FWPM_FILTER* pFilter)
{
ASSERT(pFilter);
return PrvScenarioFastStreamInjectionDeleteFwpmObjects(pFilter);
}
/**
@scenario_function="ScenarioFastStreamInjectionAdd"
Purpose: Scenario which will blindly reinject the classified traffic. <br>
<br>
Notes: Adds a filter which references one of the
WFPSAMPLER_CALLOUT_FAST_STREAM_INJECTION callouts for the provided layer. <br>
<br>
No data modification is made to the traffic, and checks are in place to prevent
infinite reinjection of the traffic. <br>
<br>
Ideal usage is to implement in the presence of a 3rd party firewall to see how they
coexist with another provider performing injection. <br>
<br>
MSDN_Ref: <br>
*/
_Success_(return == NO_ERROR)
UINT32 ScenarioFastStreamInjectionAdd(_In_ const FWPM_FILTER* pFilter)
{
ASSERT(pFilter);
return PrvScenarioFastStreamInjectionAddFwpmObjects(pFilter);
}
/**
@rpc_function="RPCInvokeScenarioFastStreamInjection"
Purpose: RPC exposed function used to dipatch the scenario routines for
SCENARIO_FAST_STREAM_INJECTION. <br>
<br>
Notes: <br>
<br>
MSDN_Ref: <br>
*/
error_status_t RPCInvokeScenarioFastStreamInjection(/* [in] */ handle_t rpcBindingHandle,
/* [in] */ WFPSAMPLER_SCENARIO scenario,
/* [in] */ FWPM_CHANGE_TYPE changeType,
/* [ref][in] */ __RPC__in const FWPM_FILTER0* pFilter)
{
UNREFERENCED_PARAMETER(rpcBindingHandle);
UNREFERENCED_PARAMETER(scenario);
ASSERT(pFilter);
ASSERT(scenario == SCENARIO_FAST_STREAM_INJECTION);
ASSERT(changeType < FWPM_CHANGE_TYPE_MAX);
UINT32 status = NO_ERROR;
if(changeType == FWPM_CHANGE_ADD)
status = ScenarioFastStreamInjectionAdd(pFilter);
else
status = ScenarioFastStreamInjectionRemove(pFilter);
return status;
}
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