Leaked source code of windows server 2003
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/******************************************************************************
* PROCUTIL.C
*
* This is a scaled down version of procutil.c from utils\citrix\utilsub
* that is included here.
*
* We can not use utilsub.lib unless we modify every user of perflib.lib
* to also include this library. Also since utilsub.lib includes 'C' runtimes
* such as malloc() and free(), we would have to also include 'C' runtimes
* with every user of this library. (Currently advapi32.dll and winlogon.exe)
*
*
* Copyright Citrix Systems Inc. 1994
* Copyright (C) 1997-1999 Microsoft Corp.
*
* Author: John Richardson
*******************************************************************************/
#include "precomp.h"
#pragma hdrstop
#define MAX_USER_NAME_LENGTH (MAX_PATH*sizeof(WCHAR))
#define MAX_WINSTATION_NAME_LENGTH (MAX_PATH*sizeof(WCHAR))
#define ALLOCMEM(heap, flags, size) HeapAlloc (heap, flags, size)
#define REALLOCMEM(heap, flags, pointer, newsize) \
HeapReAlloc (heap, flags, pointer, newsize)
#define FREEMEM(heap, flags, pointer) HeapFree (heap, flags, pointer)
/*
* Set MAX_DOMAIN_LENGTH to MAX_USER_NAME_LENGTH
*/
#define MAX_DOMAIN_LENGTH MAX_USER_NAME_LENGTH
/*
* Local function prototypes.
*/
VOID LookupSidUser( PSID pSid, PWCHAR pUserName, PULONG pcbUserName );
VOID RefreshUserSidCrcCache( void );
/*******************************************************************************
*
* CalculateCrc16
*
* Calculates a 16-bit CRC of the specified buffer.
*
* ENTRY:
* pBuffer (input)
* Points to buffer to calculate CRC for.
* length (input)
* Length in bytes of the buffer.
*
* EXIT:
* (USHORT)
* The 16-bit CRC of the buffer.
*
******************************************************************************/
/*
* updcrc macro derived from article Copyright (C) 1986 Stephen Satchell.
* NOTE: First argument must be in range 0 to 255.
* Second argument is referenced twice.
*
* Programmers may incorporate any or all code into their programs,
* giving proper credit within the source. Publication of the
* source routines is permitted so long as proper credit is given
* to Stephen Satchell, Satchell Evaluations and Chuck Forsberg,
* Omen Technology.
*/
#define updcrc(cp, crc) ( crctab[((crc >> 8) & 255)] ^ (crc << 8) ^ cp)
/* crctab calculated by Mark G. Mendel, Network Systems Corporation */
unsigned short crctab[256] = {
0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
0x3653, 0x2672, 0x1611, 0x0630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
0x48c4, 0x58e5, 0x6886, 0x78a7, 0x0840, 0x1861, 0x2802, 0x3823,
0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0x0a50, 0x3a33, 0x2a12,
0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0x0c60, 0x1c41,
0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0x0e70,
0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
0x1080, 0x00a1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
0x02b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
0x34e2, 0x24c3, 0x14a0, 0x0481, 0x7466, 0x6447, 0x5424, 0x4405,
0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
0x26d3, 0x36f2, 0x0691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x08e1, 0x3882, 0x28a3,
0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
0x4a75, 0x5a54, 0x6a37, 0x7a16, 0x0af1, 0x1ad0, 0x2ab3, 0x3a92,
0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0
};
USHORT
CalculateCrc16( PBYTE pBuffer,
USHORT length )
{
USHORT Crc = 0;
USHORT Data;
while ( length-- ) {
Data = (USHORT) *pBuffer++;
Crc = updcrc( Data, Crc );
}
return(Crc);
} /* CalculateCrc16() */
/*
* RefreshCitrixObjectCaches()
*
* Refresh (invalidate) any caches that may be used by Citrix object
* utilities.
*
*/
VOID
RefreshCitrixObjectCaches()
{
RefreshUserSidCrcCache();
}
/*
* This is the cache maintained by the GetUserNameFromSid function
*
* It is thread safe through the use of ULock.
*/
typedef struct TAGUSERSIDLIST {
struct TAGUSERSIDLIST *Next;
USHORT SidCrc;
WCHAR UserName[MAX_USER_NAME_LENGTH];
} USERSIDLIST, *PUSERSIDLIST;
static PUSERSIDLIST pUList = NULL;
static RTL_CRITICAL_SECTION ULock;
static BOOLEAN ULockInited = FALSE;
/***************************************************************************
*
* InitULock
*
* Since we do not require the user to call an initialize function,
* we must initialize our critical section in a thread safe manner.
*
* The problem is, a critical section is needed to guard against multiple
* threads trying to init the critical section at the same time.
*
* The solution that Nt uses, in which RtlInitializeCriticalSection itself
* uses, is to wait on a kernel supported process wide Mutant before proceding.
* This Mutant almost works by itself, but RtlInitializeCriticalSection does
* not wait on it until after trashing the semaphore count. So we wait on
* it ourselves, since it can be acquired recursively.
*
***************************************************************************/
NTSTATUS InitULock()
{
NTSTATUS Status = STATUS_SUCCESS;
RtlEnterCriticalSection((PRTL_CRITICAL_SECTION)NtCurrentPeb()->LoaderLock);
/*
* Make sure another thread did not beat us here
*/
if( ULockInited == FALSE ){
Status = RtlInitializeCriticalSection( &ULock );
if (NT_SUCCESS(Status)) {
ULockInited = TRUE;
}
}
RtlLeaveCriticalSection((PRTL_CRITICAL_SECTION)NtCurrentPeb()->LoaderLock);
return Status;
}
/***************************************************************************
*
* RefreshUserSidCrcCache
*
* Invalidate the User/SidCrc cache so that the newest information
* will be fetched from the system.
*
***************************************************************************/
VOID
RefreshUserSidCrcCache( void )
{
PUSERSIDLIST pEntry, pNext;
NTSTATUS Status;
if( pUList == NULL ) return;
/*
* Make sure critical section has been inited
*/
if( !ULockInited ) {
Status = InitULock();
if (!NT_SUCCESS(Status)) {
return;
}
}
RtlEnterCriticalSection( &ULock );
pEntry = pUList;
while( pEntry ) {
pNext = pEntry->Next;
FREEMEM( RtlProcessHeap(), 0, pEntry );
pEntry = pNext;
}
pUList = NULL;
RtlLeaveCriticalSection( &ULock );
}
/******************************************************************************
*
* GetUserNameFromSid
*
* Attempts to retrieve the user (login) name of the process by first looking
* in our User/SidCrc cache table, then (if no match) looking up the SID in
* the SAM database and adding the new entry to the User/SidCrc table.
*
* Input
*
* IN pUserSid Sid pointer
*
* OUT ppName pointer to PWCHAR
*
* Will always return a user name, which will be "(unknown)" if the SID is
* invalid or can't determine the user/SID relationship for any other reason.
*
*****************************************************************************/
NTSTATUS
GetUserNameFromSid( PSID pUserSid, PWCHAR *ppName )
{
USHORT SidCrc = 0;
PUSERSIDLIST pEntry;
WCHAR pNameBuf[MAX_USER_NAME_LENGTH];
ULONG NameLength;
NTSTATUS Status;
/*
* Make sure critical section has been inited
*/
if( !ULockInited ) {
Status = InitULock();
if (!NT_SUCCESS(Status)) {
return Status;
}
}
/*
* Determine SID length in bytes and calculate a 16-bit CRC for it,
* to facilitate quick matching.
*/
if ( pUserSid ) {
SidCrc = CalculateCrc16( (PBYTE)pUserSid,
(USHORT)GetLengthSid(pUserSid) );
}
else {
// A NULL SID has a CRC of 0
SidCrc = 0;
}
/*
* First: Before performing the expensive LookupAccountSid() function,
* see if we've encountered this SID already, and match the user name
* if so.
*/
if ( pUList ) {
RtlEnterCriticalSection( &ULock );
pEntry = pUList;
while( pEntry ) {
if ( SidCrc == pEntry->SidCrc ) {
// We got a hit, return the name
*ppName = pEntry->UserName;
RtlLeaveCriticalSection( &ULock );
return(STATUS_SUCCESS);
}
pEntry = pEntry->Next;
}
RtlLeaveCriticalSection( &ULock );
}
/*
* Last resort: Determine the user name associated with the SID using
* the LookupAccountSid() API, embedded in our local function
* LookupSidUser().
*/
NameLength = MAX_USER_NAME_LENGTH;
if( pUserSid ) {
LookupSidUser( pUserSid, pNameBuf, &NameLength );
}
else {
// NULL SID maps the the "Idle" user name string
wcscpy( pNameBuf, L"Idle" );
}
/*
* Add this new User/Sid relationship in our User/Sid cache list.
*/
RtlEnterCriticalSection( &ULock );
if ( (pEntry = (PUSERSIDLIST)ALLOCMEM(RtlProcessHeap(), 0, sizeof(USERSIDLIST))) ) {
pEntry->SidCrc = SidCrc;
wcsncpy( pEntry->UserName, pNameBuf, MAX_USER_NAME_LENGTH - 1 );
pEntry->UserName[MAX_USER_NAME_LENGTH-1] = 0;
pEntry->Next = pUList;
pUList = pEntry;
// Return the name
*ppName = pEntry->UserName;
}
RtlLeaveCriticalSection( &ULock );
return(STATUS_SUCCESS);
}
/******************************************************************************
* LookupSidUser
*
* Fetch the user name associated with the specified SID.
*
* ENTRY:
* pSid (input)
* Points to SID to match to user name.
* pUserName (output)
* Points to buffer to place the user name into.
* pcbUserName (input/output)
* Specifies the size in bytes of the user name buffer. The returned
* user name will be truncated to fit this buffer (including NUL
* terminator) if necessary and this variable set to the number of
* characters copied to pUserName.
*
* EXIT:
*
* LookupSidUser() will always return a user name. If the specified
* SID fails to match to a user name, then the user name "(unknown)" will
* be returned.
*
*****************************************************************************/
VOID
LookupSidUser( PSID pSid,
PWCHAR pUserName,
PULONG pcbUserName )
{
WCHAR DomainBuffer[MAX_DOMAIN_LENGTH], UserBuffer[MAX_USER_NAME_LENGTH];
DWORD cDomainBuffer = sizeof(DomainBuffer) / sizeof(WCHAR);
DWORD cUserBuffer = sizeof(UserBuffer) / sizeof(WCHAR);
DWORD Error;
PWCHAR pDomainBuffer = NULL, pUserBuffer = NULL;
SID_NAME_USE SidNameUse;
PWCHAR pUnknown = L"(Unknown)";
/*
* Fetch user name from SID: try user lookup with a reasonable Domain and
* Sid buffer size first, before resorting to alloc.
*/
if ( !LookupAccountSid( NULL, pSid,
UserBuffer, &cUserBuffer,
DomainBuffer, &cDomainBuffer, &SidNameUse ) ) {
if ( ((Error = GetLastError()) == ERROR_INSUFFICIENT_BUFFER) ) {
if ( cDomainBuffer > (sizeof(DomainBuffer) / sizeof(WCHAR)) ) {
if ( !(pDomainBuffer =
(PWCHAR)ALLOCMEM( RtlProcessHeap(), 0,
cDomainBuffer * sizeof(WCHAR))) ) {
Error = ERROR_NOT_ENOUGH_MEMORY;
goto BadDomainAlloc;
}
}
if ( cUserBuffer > (sizeof(UserBuffer) / sizeof(WCHAR)) ) {
if ( !(pUserBuffer =
(PWCHAR)ALLOCMEM( RtlProcessHeap(), 0,
cUserBuffer * sizeof(WCHAR))) ) {
Error = ERROR_NOT_ENOUGH_MEMORY;
goto BadUserAlloc;
}
}
if ( !LookupAccountSid( NULL, pSid,
pUserBuffer ?
pUserBuffer : UserBuffer,
&cUserBuffer,
pDomainBuffer ?
pDomainBuffer : DomainBuffer,
&cDomainBuffer,
&SidNameUse ) ) {
Error = GetLastError();
goto BadLookup;
}
} else {
goto BadLookup;
}
}
/*
* Copy the user name into the specified buffer, truncating if necessary.
*/
wcsncpy( pUserName, pUserBuffer ? pUserBuffer : UserBuffer,
((*pcbUserName)-1) );
pUserName[((*pcbUserName)-1)] = 0;
*pcbUserName = wcslen(pUserName);
/*
* Free our allocs (if any) and return.
*/
if ( pDomainBuffer )
FREEMEM( RtlProcessHeap(), 0, pDomainBuffer);
if ( pUserBuffer )
FREEMEM( RtlProcessHeap(), 0, pUserBuffer);
return;
/*--------------------------------------
* Error clean-up and return...
*/
BadLookup:
BadUserAlloc:
BadDomainAlloc:
if ( pDomainBuffer )
FREEMEM( RtlProcessHeap(), 0, pDomainBuffer);
if ( pUserBuffer )
FREEMEM( RtlProcessHeap(), 0, pUserBuffer);
wcsncpy( pUserName, pUnknown, ((*pcbUserName)-1) );
pUserName[((*pcbUserName)-1)] = 0;
*pcbUserName = wcslen(pUserName);
return;
}