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debug.c
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debug.c
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/*
* Copyright (c) 2004 Security Architects Corporation. All rights reserved.
*
* Module Name:
*
* debug.c
*
* Abstract:
*
* This module implements various debug hooking routines.
*
* Author:
*
* Eugene Tsyrklevich 23-Apr-2004
*
* Revision History:
*
* None.
*/
#include <NTDDK.h>
#include "debug.h"
#include "hookproc.h"
#include "procname.h"
#include "learn.h"
#include "log.h"
#ifdef ALLOC_PRAGMA
#pragma alloc_text (INIT, InitDebugHooks)
#endif
fpZwDebugActiveProcess OriginalNtDebugActiveProcess = NULL;
//XXX http://www.nsfocus.net/index.php?act=magazine&do=view&mid=2108
/*
* IsDebuggingAllowed()
*
* Description:
* Check whether the current process is allowed to use debugging functionality.
*
* Parameters:
* None.
*
* Returns:
* FALSE if debugging is disabled. TRUE otherwise.
*/
BOOLEAN
IsDebuggingAllowed()
{
PIMAGE_PID_ENTRY CurrentProcess;
BOOLEAN DebuggingAllowed = FALSE;
/* check the global policy first */
if (! IS_DEBUGGING_PROTECTION_ON(gSecPolicy))
return TRUE;
/* now check the process specific policy */
CurrentProcess = FindImagePidEntry(CURRENT_PROCESS_PID, 0);
if (CurrentProcess != NULL)
{
DebuggingAllowed = ! IS_DEBUGGING_PROTECTION_ON(CurrentProcess->SecPolicy);
}
else
{
LOG(LOG_SS_DEBUG, LOG_PRIORITY_DEBUG, ("%d IsDebuggingAllowed: CurrentProcess = NULL!\n", CURRENT_PROCESS_PID));
}
return DebuggingAllowed;
}
/*
* HookedNtDebugActiveProcess()
*
* Description:
* This function mediates the NtDebugActiveProcess() system service and disallows
* debugging.
*
* Parameters:
* Those of NtDebugActiveProcess().
*
* Returns:
* STATUS_ACCESS_DENIED if the call does not pass the security policy check.
* Otherwise, NTSTATUS returned by NtDebugActiveProcess().
*/
NTSTATUS
NTAPI
HookedNtDebugActiveProcess
(
UINT32 Unknown1,
UINT32 Unknown2
)
{
HOOK_ROUTINE_ENTER();
LOG(LOG_SS_DEBUG, LOG_PRIORITY_DEBUG, ("HookedNtDebugActiveProcess(%x %x)\n", Unknown1, Unknown2));
if (LearningMode == FALSE && IsDebuggingAllowed() == FALSE)
{
LOG(LOG_SS_DEBUG, LOG_PRIORITY_DEBUG, ("%d (%S) HookedNtDebugActiveProcess: disallowing debugging\n", (ULONG) PsGetCurrentProcessId(), GetCurrentProcessName()));
LogAlert(ALERT_SS_DEBUG, OP_DEBUG, ALERT_RULE_NONE, ACTION_DENY, ALERT_PRIORITY_MEDIUM, NULL, 0, NULL);
HOOK_ROUTINE_EXIT( STATUS_ACCESS_DENIED );
}
ASSERT(OriginalNtDebugActiveProcess);
rc = OriginalNtDebugActiveProcess(Unknown1, Unknown2);
if (LearningMode == TRUE)
TURN_DEBUGGING_PROTECTION_OFF(NewPolicy);
HOOK_ROUTINE_EXIT(rc);
}
/*
* InitDebugHooks()
*
* Description:
* Initializes all the mediated debug operation pointers. The "OriginalFunction" pointers
* are initialized by InstallSyscallsHooks() that must be called prior to this function.
*
* NOTE: Called once during driver initialization (DriverEntry()).
*
* Parameters:
* None.
*
* Returns:
* TRUE to indicate success, FALSE if failed.
*/
BOOLEAN
InitDebugHooks()
{
if ( (OriginalNtDebugActiveProcess = (fpZwDebugActiveProcess) ZwCalls[ZW_DEBUG_ACTIVEPROCESS_INDEX].OriginalFunction) == NULL)
{
/* does not exist on Win2K */
LOG(LOG_SS_DEBUG, LOG_PRIORITY_DEBUG, ("InitDebugHooks: OriginalNtDebugActiveProcess is NULL\n"));
}
return TRUE;
}