How to enumerate process' handles?

Question

Is there any way how to enumerate process with given PID in windows, and get list of all his opened handles(locked files, etc.)?

EDIT: I dont care about language. If it is in .NET, I'd be glad, if in WinApi (C), it won't hurt. If in something else, I think I can rewrite it :-)

Answer 1

I did a deep googling and found this article. This article gave a link to download source code:

I tried method in NtSystemInfoTest.cpp ( downloaded source code ) and it worked superbly.

void ListHandles( DWORD processID, LPCTSTR lpFilter )

The code has following declaimer:

// Written by Zoltan Csizmadia, zoltan_csizmadia@yahoo.com
// For companies(Austin,TX): If you would like to get my resume, send an email.
//
// The source is free, but if you want to use it, mention my name and e-mail address
//
//////////////////////////////////////////////////////////////////////////////////////
//

I hope this helps you.

Answer 2

The command-line 'Handle' tool from Sysinternals does this, if you just want a tool. This won't help you if you're looking for a code solution, though.

Answer 3

Here is an example using ZwQueryProcessInformation from the DDK. The DDK is now known as the "WDK" and is available with MSDN. If you don't have MSDN, apparantly, you can also get it from here.

I haven't tried it, I just googled your question.

#include "ntdll.h"
#include <stdlib.h>
#include <stdio.h>
#include "ntddk.h"

#define DUPLICATE_SAME_ATTRIBUTES 0x00000004

#pragma comment(lib,"ntdll.lib")

BOOL EnablePrivilege(PCSTR name)
{
TOKEN_PRIVILEGES priv = {1, {0, 0, SE_PRIVILEGE_ENABLED}};
LookupPrivilegeValue(0, name, &priv.Privileges[0].Luid);

HANDLE hToken;
OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES, &hToken);

AdjustTokenPrivileges(hToken, FALSE, &priv, sizeof priv, 0, 0);
BOOL rv = GetLastError() == ERROR_SUCCESS;

CloseHandle(hToken);
return rv;
}

int main(int argc, char *argv[])
{
if (argc == 1) return 0;

ULONG pid = strtoul(argv[1], 0, 0);

EnablePrivilege(SE_DEBUG_NAME);

HANDLE hProcess = OpenProcess(PROCESS_DUP_HANDLE, FALSE, pid);

ULONG n = 0x1000;
PULONG p = new ULONG[n];

while (NT::ZwQuerySystemInformation(NT::SystemHandleInformation, p, n * sizeof *p, 0)
== STATUS_INFO_LENGTH_MISMATCH)

delete [] p, p = new ULONG[n *= 2];

NT::PSYSTEM_HANDLE_INFORMATION h = NT::PSYSTEM_HANDLE_INFORMATION(p + 1);

for (ULONG i = 0; i < *p; i++) {

if (h[i].ProcessId == pid) {
HANDLE hObject;

if (NT::ZwDuplicateObject(hProcess, HANDLE(h[i].Handle), NtCurrentProcess(), &hObject,
0, 0, DUPLICATE_SAME_ATTRIBUTES)
!= STATUS_SUCCESS) continue;

NT::OBJECT_BASIC_INFORMATION obi;

NT::ZwQueryObject(hObject, NT::ObjectBasicInformation, &obi, sizeof obi, &n);

printf("%p %04hx %6lx %2x %3lx %3ld %4ld ",
h[i].Object, h[i].Handle, h[i].GrantedAccess,
int(h[i].Flags), obi.Attributes,
obi.HandleCount - 1, obi.PointerCount - 2);

n = obi.TypeInformationLength + 2;

NT::POBJECT_TYPE_INFORMATION oti = NT::POBJECT_TYPE_INFORMATION(new CHAR[n]);

NT::ZwQueryObject(hObject, NT::ObjectTypeInformation, oti, n, &n);

printf("%-14.*ws ", oti[0].Name.Length / 2, oti[0].Name.Buffer);

n = obi.NameInformationLength == 0
? MAX_PATH * sizeof (WCHAR) : obi.NameInformationLength;

NT::POBJECT_NAME_INFORMATION oni = NT::POBJECT_NAME_INFORMATION(new CHAR[n]);

NTSTATUS rv = NT::ZwQueryObject(hObject, NT::ObjectNameInformation, oni, n, &n);
if (NT_SUCCESS(rv))
printf("%.*ws", oni[0].Name.Length / 2, oni[0].Name.Buffer);

printf("\n");

CloseHandle(hObject);
}
}
delete [] p;

CloseHandle(hProcess);

return 0;
}

Answer 4

And here is what looks like a good answer from the Sysinternals forum: HOWTO: Enumerate handles