1 files changed, 187 insertions, 0 deletions

diff --git a/atom.c b/atom.c
new file mode 100644
index 0000000..91ecc98
--- /dev/null
+++ b/atom.c
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+/*
+ * Copyright (c) 2004 Security Architects Corporation. All rights reserved.
+ *
+ * Module Name:
+ *
+ *              atom.c
+ *
+ * Abstract:
+ *
+ *              This module implements various atom hooking routines.
+ *
+ * Author:
+ *
+ *              Eugene Tsyrklevich 25-Mar-2004
+ *
+ * Revision History:
+ *
+ *              None.
+ */
+
+
+#include "atom.h"
+
+
+#ifdef ALLOC_PRAGMA
+#pragma alloc_text (INIT, InitAtomHooks)
+#endif
+
+
+fpZwAddAtom                     OriginalNtAddAtom = NULL;
+fpZwFindAtom            OriginalNtFindAtom = NULL;
+
+
+
+/*
+ * HookedNtCreateAtom()
+ *
+ * Description:
+ *              This function mediates the NtAddAtom() system service and checks the
+ *              provided atom name against the global and current process security policies.
+ *
+ *              NOTE: ZwAddAtom adds an atom to the global atom table. [NAR]
+ *
+ * Parameters:
+ *              Those of NtAddAtom().
+ *
+ * Returns:
+ *              STATUS_ACCESS_DENIED if the call does not pass the security policy check.
+ *              Otherwise, NTSTATUS returned by NtAddAtom().
+ */
+
+NTSTATUS
+NTAPI
+HookedNtAddAtom
+(
+        IN PWSTR String,
+        IN ULONG StringLength,
+        OUT PUSHORT Atom
+)
+{
+        PCHAR   FunctionName = "HookedNtAddAtom";
+        CHAR    ATOMNAME[MAX_PATH];
+
+
+        HOOK_ROUTINE_ENTER();
+
+
+        if (!VerifyPwstr(String, StringLength))
+        {
+                LOG(LOG_SS_ATOM, LOG_PRIORITY_DEBUG, ("HookedNtAddAtom: VerifyPwstr(%x) failed\n", String));
+                HOOK_ROUTINE_EXIT( STATUS_ACCESS_DENIED );
+        }
+
+
+        _snprintf(ATOMNAME, MAX_PATH, "%S", String);
+        ATOMNAME[ MAX_PATH - 1 ] = 0;
+
+
+        if (LearningMode == FALSE)
+        {
+                POLICY_CHECK_OPTYPE_NAME(ATOM, OP_WRITE);
+        }
+
+
+        ASSERT(OriginalNtAddAtom);
+
+        rc = OriginalNtAddAtom(String, StringLength, Atom);
+
+
+        HOOK_ROUTINE_FINISH_OBJECTNAME_OPTYPE(ATOM, ATOMNAME, OP_WRITE);
+}
+
+
+
+/*
+ * HookedNtFindAtom()
+ *
+ * Description:
+ *              This function mediates the NtFindAtom() system service and checks the
+ *              provided atom name against the global and current process security policies.
+ *
+ *              NOTE: ZwFindAtom searches for an atom in the global atom table. [NAR]
+ *
+ * Parameters:
+ *              Those of NtFindAtom().
+ *
+ * Returns:
+ *              STATUS_ACCESS_DENIED if the call does not pass the security policy check.
+ *              Otherwise, NTSTATUS returned by NtFindAtom().
+ */
+
+NTSTATUS
+NTAPI
+HookedNtFindAtom
+(
+        IN PWSTR String,
+        IN ULONG StringLength,
+        OUT PUSHORT Atom
+)
+{
+        PCHAR   FunctionName = "HookedNtFindAtom";
+        CHAR    ATOMNAME[MAX_PATH];
+
+
+        HOOK_ROUTINE_ENTER();
+
+
+        if (!VerifyPwstr(String, StringLength))
+        {
+                LOG(LOG_SS_ATOM, LOG_PRIORITY_DEBUG, ("HookedNtFindAtom: VerifyPwstr(%x) failed\n", String));
+                HOOK_ROUTINE_EXIT( STATUS_ACCESS_DENIED );
+        }
+
+
+        _snprintf(ATOMNAME, MAX_PATH, "%S", String);
+        ATOMNAME[ MAX_PATH - 1 ] = 0;
+
+
+        if (LearningMode == FALSE)
+        {
+                POLICY_CHECK_OPTYPE_NAME(ATOM, OP_READ);
+        }
+
+
+        ASSERT(OriginalNtFindAtom);
+
+        rc = OriginalNtFindAtom(String, StringLength, Atom);
+
+
+        HOOK_ROUTINE_FINISH_OBJECTNAME_OPTYPE(ATOM, ATOMNAME, OP_READ);
+}
+
+
+
+/*
+ * InitAtomHooks()
+ *
+ * Description:
+ *              Initializes all the mediated atom 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
+InitAtomHooks()
+{
+        if ( (OriginalNtAddAtom = (fpZwAddAtom) ZwCalls[ZW_ADD_ATOM_INDEX].OriginalFunction) == NULL)
+        {
+                LOG(LOG_SS_ATOM, LOG_PRIORITY_DEBUG, ("InitAtomHooks: OriginalNtAddAtom is NULL\n"));
+                return FALSE;
+        }
+
+        if ( (OriginalNtFindAtom = (fpZwFindAtom) ZwCalls[ZW_FIND_ATOM_INDEX].OriginalFunction) == NULL)
+        {
+                LOG(LOG_SS_ATOM, LOG_PRIORITY_DEBUG, ("InitAtomHooks: OriginalNtFindAtom is NULL\n"));
+                return FALSE;
+        }
+
+        return TRUE;
+}