initial commit

1 files changed, 151 insertions, 0 deletions

diff --git a/timer.c b/timer.c
new file mode 100644
index 0000000..3210000
--- /dev/null
+++ b/timer.c
@@ -0,0 +1,151 @@
+/*
+ * Copyright (c) 2004 Security Architects Corporation. All rights reserved.
+ *
+ * Module Name:
+ *
+ *              timer.c
+ *
+ * Abstract:
+ *
+ *              This module implements various timer hooking routines.
+ *
+ * Author:
+ *
+ *              Eugene Tsyrklevich 25-Mar-2004
+ *
+ * Revision History:
+ *
+ *              None.
+ */
+
+
+#include "timer.h"
+
+
+#ifdef ALLOC_PRAGMA
+#pragma alloc_text (INIT, InitTimerHooks)
+#endif
+
+
+fpZwCreateTimer         OriginalNtCreateTimer = NULL;
+fpZwOpenTimer           OriginalNtOpenTimer = NULL;
+
+
+/*
+ * HookedNtCreateTimer()
+ *
+ * Description:
+ *              This function mediates the NtCreateTimer() system service and checks the
+ *              provided timer name against the global and current process security policies.
+ *
+ *              NOTE: ZwCreateTimer creates or opens a timer object. [NAR]
+ *
+ * Parameters:
+ *              Those of NtCreateTimer().
+ *
+ * Returns:
+ *              STATUS_ACCESS_DENIED if the call does not pass the security policy check.
+ *              Otherwise, NTSTATUS returned by NtCreateTimer().
+ */
+
+NTSTATUS
+NTAPI
+HookedNtCreateTimer
+(
+        OUT PHANDLE TimerHandle,
+        IN ACCESS_MASK DesiredAccess,
+        IN POBJECT_ATTRIBUTES ObjectAttributes,
+        IN TIMER_TYPE TimerType
+)
+{
+        PCHAR   FunctionName = "HookedNtCreateTimer";
+
+
+        HOOK_ROUTINE_START(TIMER);
+
+
+        ASSERT(OriginalNtCreateTimer);
+
+        rc = OriginalNtCreateTimer(TimerHandle, DesiredAccess, ObjectAttributes, TimerType);
+
+
+        HOOK_ROUTINE_FINISH(TIMER);
+}
+
+
+
+/*
+ * HookedNtOpenTimer()
+ *
+ * Description:
+ *              This function mediates the NtOpenTimer() system service and checks the
+ *              provided timer name against the global and current process security policies.
+ *
+ *              NOTE: ZwOpenTimer opens a timer object. [NAR]
+ *
+ * Parameters:
+ *              Those of NtOpenTimer().
+ *
+ * Returns:
+ *              STATUS_ACCESS_DENIED if the call does not pass the security policy check.
+ *              Otherwise, NTSTATUS returned by NtOpenTimer().
+ */
+
+NTSTATUS
+NTAPI
+HookedNtOpenTimer
+(
+        OUT PHANDLE TimerHandle,
+        IN ACCESS_MASK DesiredAccess,
+        IN POBJECT_ATTRIBUTES ObjectAttributes
+)
+{
+        PCHAR   FunctionName = "HookedNtOpenTimer";
+
+
+        HOOK_ROUTINE_START(TIMER);
+
+
+        ASSERT(OriginalNtOpenTimer);
+
+        rc = OriginalNtOpenTimer(TimerHandle, DesiredAccess, ObjectAttributes);
+
+
+        HOOK_ROUTINE_FINISH(TIMER);
+}
+
+
+
+/*
+ * InitTimerHooks()
+ *
+ * Description:
+ *              Initializes all the mediated timer 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
+InitTimerHooks()
+{
+        if ( (OriginalNtCreateTimer = (fpZwCreateTimer) ZwCalls[ZW_CREATE_TIMER_INDEX].OriginalFunction) == NULL)
+        {
+                LOG(LOG_SS_TIMER, LOG_PRIORITY_DEBUG, ("InitTimerHooks: OriginalNtCreateTimer is NULL\n"));
+                return FALSE;
+        }
+
+        if ( (OriginalNtOpenTimer = (fpZwOpenTimer) ZwCalls[ZW_OPEN_TIMER_INDEX].OriginalFunction) == NULL)
+        {
+                LOG(LOG_SS_TIMER, LOG_PRIORITY_DEBUG, ("InitTimerHooks: OriginalNtOpenTimer is NULL\n"));
+                return FALSE;
+        }
+
+        return TRUE;
+}