1 files changed, 190 insertions, 0 deletions

diff --git a/time.c b/time.c
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--- /dev/null
+++ b/time.c
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+/*
+ * Copyright (c) 2004 Security Architects Corporation. All rights reserved.
+ *
+ * Module Name:
+ *
+ *              time.c
+ *
+ * Abstract:
+ *
+ *              This module defines various routines used for hooking time routines.
+ *
+ * Author:
+ *
+ *              Eugene Tsyrklevich 10-Mar-2004
+ *
+ * Revision History:
+ *
+ *              None.
+ */
+
+
+#include <NTDDK.h>
+#include "time.h"
+#include "hookproc.h"
+#include "procname.h"
+#include "learn.h"
+#include "misc.h"
+#include "log.h"
+
+
+#ifdef ALLOC_PRAGMA
+#pragma alloc_text (INIT, InitTimeHooks)
+#endif
+
+
+fpZwSetSystemTime                       OriginalNtSetSystemTime = NULL;
+fpZwSetTimerResolution          OriginalNtSetTimerResolution = NULL;
+
+
+
+/*
+ * HookedNtSetSystemTime()
+ *
+ * Description:
+ *              This function mediates the NtSetSystemTime() system service and disallows applications
+ *              to change the system time.
+ *
+ *              NOTE: ZwSetSystemTime sets the system time. [NAR]
+ *
+ * Parameters:
+ *              Those of NtSetSystemTime().
+ *
+ * Returns:
+ *              STATUS_ACCESS_DENIED if time changing is disabled.
+ *              Otherwise, NTSTATUS returned by NtSetSystemTime().
+ */
+
+NTSTATUS
+NTAPI
+HookedNtSetSystemTime
+(
+        IN PLARGE_INTEGER NewTime,
+        OUT PLARGE_INTEGER OldTime OPTIONAL
+)
+{
+        PCHAR                   FunctionName = "HookedNtSetSystemTime";
+        PCHAR                   TIMENAME = NULL;        /* allow the use of POLICY_CHECK_OPTYPE_NAME() macro */
+
+
+        HOOK_ROUTINE_ENTER();
+
+
+        LOG(LOG_SS_TIME, LOG_PRIORITY_DEBUG, ("%d (%S) HookedNtSetSystemTime\n", (ULONG) PsGetCurrentProcessId(), GetCurrentProcessName()));
+
+
+        /* NOTE: same code is replicated in sysinfo.c */
+
+        if (LearningMode == FALSE)
+        {
+                POLICY_CHECK_OPTYPE_NAME(TIME, OP_TIME_CHANGE);
+        }
+
+
+        ASSERT(OriginalNtSetSystemTime);
+
+        rc = OriginalNtSetSystemTime(NewTime, OldTime);
+
+
+        if (LearningMode == TRUE)
+        {
+                AddRule(RULE_TIME, NULL, OP_TIME_CHANGE);
+        }
+
+        HOOK_ROUTINE_EXIT(rc);
+}
+
+
+
+/*
+ * HookedNtSetTimerResolution()
+ *
+ * Description:
+ *              This function mediates the NtSetTimerResolution() system service and disallows applications
+ *              to change the system time.
+ *
+ *              NOTE: ZwSetTimerResolution sets the resolution of the system timer. [NAR]
+ *
+ * Parameters:
+ *              Those of NtSetTimerResolution().
+ *
+ * Returns:
+ *              STATUS_ACCESS_DENIED if time changing is disabled.
+ *              Otherwise, NTSTATUS returned by NtSetTimerResolution().
+ */
+
+NTSTATUS
+NTAPI
+HookedNtSetTimerResolution
+(
+        IN ULONG RequestedResolution,
+        IN BOOLEAN Set,
+        OUT PULONG ActualResolution
+)
+{
+        PCHAR                   FunctionName = "HookedNtSetTimerResolution";
+        PCHAR                   TIMENAME = NULL;        /* allow the use of POLICY_CHECK_OPTYPE_NAME() macro */
+
+
+        HOOK_ROUTINE_ENTER();
+
+
+        LOG(LOG_SS_TIME, LOG_PRIORITY_DEBUG, ("%d (%S) HookedNtSetTimerResolution\n", (ULONG) PsGetCurrentProcessId(), GetCurrentProcessName()));
+
+
+        if (LearningMode == FALSE)
+        {
+                POLICY_CHECK_OPTYPE_NAME(TIME, OP_TIME_CHANGE);
+        }
+
+
+        ASSERT(OriginalNtSetTimerResolution);
+
+        rc = OriginalNtSetTimerResolution(RequestedResolution, Set, ActualResolution);
+
+
+        if (LearningMode == TRUE)
+        {
+                AddRule(RULE_TIME, NULL, OP_TIME_CHANGE);
+        }
+
+        HOOK_ROUTINE_EXIT(rc);
+}
+
+
+
+/*
+ * InitTimeHooks()
+ *
+ * Description:
+ *              Initializes all the mediated time 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
+InitTimeHooks()
+{
+        if ((OriginalNtSetSystemTime = (fpZwSetSystemTime) ZwCalls[ZW_SET_SYSTEM_TIME_INDEX].OriginalFunction) == NULL)
+        {
+                LOG(LOG_SS_TIME, LOG_PRIORITY_DEBUG, ("InitTimeHooks: OriginalNtSetSystemTime is NULL\n"));
+                return FALSE;
+        }
+
+        /* a lot of applications seem to be calling this function thus don't intercept it */
+/*
+        if ((OriginalNtSetTimerResolution = (fpZwSetTimerResolution) ZwCalls[ZW_SET_TIMER_RESOLUTION_INDEX].OriginalFunction) == NULL)
+        {
+                LOG(LOG_SS_TIME, LOG_PRIORITY_DEBUG, ("InitTimeHooks: OriginalNtSetTimerResolution is NULL\n"));
+                return FALSE;
+        }
+*/
+        return TRUE;
+}