windows-xp/Source/XPSP1/NT/net/sfm/setup/util/access.c

#include <nt.h>
#include <ntrtl.h>
#include <nturtl.h>
#include <ntdef.h>
#include <ntstatus.h>
#include <windows.h>
#include <winspool.h>
#include <stdlib.h>
#include <ntsam.h>
#include <ntlsa.h>
#include <ntseapi.h>
#include "sfmutil.h"

extern TCHAR ReturnTextBuffer[512];


#define	AFP_MIN_ACCESS		(FILE_READ_ATTRIBUTES | \
							 READ_CONTROL)

#define	AFP_READ_ACCESS		(READ_CONTROL		 |	\
							FILE_READ_ATTRIBUTES |	\
							FILE_TRAVERSE		 |	\
							FILE_LIST_DIRECTORY	 |	\
							FILE_READ_EA)

#define	AFP_WRITE_ACCESS	(FILE_ADD_FILE		 |	\
							FILE_ADD_SUBDIRECTORY|	\
							FILE_WRITE_ATTRIBUTES|	\
							FILE_WRITE_EA		 |	\
							DELETE)

#define	AFP_OWNER_ACCESS	(WRITE_DAC			  | \
							 WRITE_OWNER)



SID	AfpSidWorld	= { 1, 1, SECURITY_WORLD_SID_AUTHORITY, SECURITY_WORLD_RID };
SID	AfpSidNull	= { 1, 1, SECURITY_NULL_SID_AUTHORITY, SECURITY_NULL_RID };
SID	AfpSidSystem = { 1, 1, SECURITY_NT_AUTHORITY, SECURITY_LOCAL_SYSTEM_RID };
SID	AfpSidCrtrOwner = { 1, 1, SECURITY_CREATOR_SID_AUTHORITY, SECURITY_CREATOR_OWNER_RID };
SID	AfpSidCrtrGroup = { 1, 1, SECURITY_CREATOR_SID_AUTHORITY, SECURITY_CREATOR_GROUP_RID };

/***	afpAddAceToAcl
 *
 *	Build an Ace corres. to the Sid(s) and mask and add these to the Acl. It is
 *	assumed that the Acl has space for the Aces. If the Mask is 0 (i.e. no access)
 *	the Ace added is a DENY Ace, else a ALLOWED ACE is added.
 */
PACCESS_ALLOWED_ACE
afpAddAceToAcl(
	IN  PACL				pAcl,
	IN  PACCESS_ALLOWED_ACE	pAce,
	IN  ACCESS_MASK			Mask,
	IN  PSID				pSid,
	IN  PSID				pSidInherit OPTIONAL
)
{
	// Add a vanilla ace
	pAcl->AceCount ++;
	pAce->Mask = Mask | SYNCHRONIZE | AFP_MIN_ACCESS;
	pAce->Header.AceFlags = 0;
	pAce->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
	pAce->Header.AceSize = (USHORT)(sizeof(ACE_HEADER) + sizeof(ACCESS_MASK) +
							RtlLengthSid(pSid));
	RtlCopySid(RtlLengthSid(pSid), (PSID)(&pAce->SidStart), pSid);

	// Now add an inherit ace
	if (1)
	{
		pAce = (PACCESS_ALLOWED_ACE)((PBYTE)pAce + pAce->Header.AceSize);
		pAcl->AceCount ++;
		pAce->Mask = Mask | SYNCHRONIZE | AFP_MIN_ACCESS;
		pAce->Header.AceFlags = CONTAINER_INHERIT_ACE |
								OBJECT_INHERIT_ACE |
								INHERIT_ONLY_ACE;
		pAce->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
		pAce->Header.AceSize = (USHORT)(sizeof(ACE_HEADER) + sizeof(ACCESS_MASK) +
								RtlLengthSid(pSid));
		RtlCopySid(RtlLengthSid(pSid), (PSID)(&pAce->SidStart), pSid);
	
		// Now add an inherit ace for the CreatorOwner/CreatorGroup
		if (ARGUMENT_PRESENT(pSidInherit))
		{
			pAce = (PACCESS_ALLOWED_ACE)((PBYTE)pAce + pAce->Header.AceSize);
			pAcl->AceCount ++;
			pAce->Mask = Mask | SYNCHRONIZE | AFP_MIN_ACCESS;
			pAce->Header.AceFlags = CONTAINER_INHERIT_ACE |
									OBJECT_INHERIT_ACE |
									INHERIT_ONLY_ACE;
			pAce->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
			pAce->Header.AceSize = (USHORT)(sizeof(ACE_HEADER) + sizeof(ACCESS_MASK) +
									RtlLengthSid(pSidInherit));
			RtlCopySid(RtlLengthSid(pSidInherit), (PSID)(&pAce->SidStart), pSidInherit);
		}
	}

	return ((PACCESS_ALLOWED_ACE)((PBYTE)pAce + pAce->Header.AceSize));
}

/***	afpMoveAces
 *
 *	Move a bunch of aces from the old security descriptor to the new security
 *	descriptor.
 */
PACCESS_ALLOWED_ACE
afpMoveAces(
	IN	PACL				pOldDacl,
	IN	PACCESS_ALLOWED_ACE	pAceStart,
	IN	PSID				pSidOldOwner,
	IN	PSID				pSidNewOwner,
	IN	PSID				pSidOldGroup,
	IN	PSID				pSidNewGroup,
	IN	BOOLEAN				DenyAces,
	IN	OUT PACL			pNewDacl
)
{
	USHORT				i;
	PACCESS_ALLOWED_ACE	pAceOld;
	PSID				pSidAce;

	for (i = 0, pAceOld = (PACCESS_ALLOWED_ACE)((PBYTE)pOldDacl + sizeof(ACL));
		 i < pOldDacl->AceCount;
		 i++, pAceOld = (PACCESS_ALLOWED_ACE)((PBYTE)pAceOld + pAceOld->Header.AceSize))
	{
		// Note: All deny aces are ahead of the grant aces.
		if (DenyAces && (pAceOld->Header.AceType != ACCESS_DENIED_ACE_TYPE))
			break;

		if (!DenyAces && (pAceOld->Header.AceType == ACCESS_DENIED_ACE_TYPE))
			continue;

		pSidAce = (PSID)(&pAceOld->SidStart);
		if (!(RtlEqualSid(pSidAce, &AfpSidWorld)		||
			  RtlEqualSid(pSidAce, pSidOldOwner)		||
			  RtlEqualSid(pSidAce, pSidNewOwner)		||
			  RtlEqualSid(pSidAce, &AfpSidCrtrOwner)	||
			  RtlEqualSid(pSidAce, pSidOldGroup)		||
			  RtlEqualSid(pSidAce, pSidNewGroup)		||
			  RtlEqualSid(pSidAce, &AfpSidCrtrGroup)))
		{
			RtlCopyMemory(pAceStart, pAceOld, pAceOld->Header.AceSize);
			pAceStart = (PACCESS_ALLOWED_ACE)((PBYTE)pAceStart +
													pAceStart->Header.AceSize);
			pNewDacl->AceCount ++;
		}
	}
	return (pAceStart);
}


/***	AfpSetAfpPermissions
 *
 *	Set the permissions on this directory. Also optionally set the owner and
 *	group ids. For setting the owner and group ids verify if the user has the
 *	needed access. This access is however not good enough. We check for this
 *	access but do the actual setting of the permissions in the special server
 *	context (RESTORE privilege is needed).
 */
BOOL
SfmSetUamSecurity(
	 DWORD cArgs,
	 LPTSTR Args[],
	 LPTSTR *TextOut
	 )

{
	NTSTATUS				Status;
	DWORD					SizeNeeded;
	PBYTE					pBuffer = NULL;
	PISECURITY_DESCRIPTOR	pSecDesc;
	SECURITY_INFORMATION	SecInfo = DACL_SECURITY_INFORMATION;
	PACL					pDaclNew = NULL;
	PACCESS_ALLOWED_ACE		pAce;
	LONG					SizeNewDacl;
	HANDLE					DirHandle;
	LPWSTR					lpwsDirPath = NULL;
	LPTSTR					pDirPath = NULL;
	UNICODE_STRING			DirectoryName;
	IO_STATUS_BLOCK			IoStatusBlock;
	DWORD					cbDirPath;
	OBJECT_ATTRIBUTES		ObjectAttributes;
	UINT					Size;


	//
	// Convert the DIR Path to UNICODE
	//

	*TextOut = ReturnTextBuffer;

    lstrcpy(ReturnTextBuffer, TEXT("FAILED"));

	if(cArgs != 1) {

	  return FALSE;

	}
	cbDirPath = (strlen((LPSTR)Args[0]) + 1) * sizeof(WCHAR);

	if((lpwsDirPath  = (LPWSTR)LocalAlloc(LPTR,cbDirPath)) == NULL)
	  return(FALSE);
	
    if(!MultiByteToWideChar(CP_ACP,
                            MB_PRECOMPOSED,
                            (LPSTR)Args[0],
                            -1,
                             lpwsDirPath,
                             cbDirPath
                            ))
   {

	  LocalFree(lpwsDirPath);
	  return(FALSE);

   }
#ifdef DEBUG
   DbgPrint("UAM: Directory = %ws\n",lpwsDirPath);
#endif

   pDirPath =  (LPTSTR)LocalAlloc(LPTR,
	           (wcslen(lpwsDirPath) + wcslen(TEXT("\\DOSDEVICES\\"))+1)
			   * sizeof(WCHAR));				

   if(pDirPath == NULL) {
#ifdef DEBUG
	  DbgPrint("UAMSETSECURITY: malloc for dir path failed\n");
#endif
	  LocalFree(lpwsDirPath);
	  return(FALSE);
   }

   wcscpy(pDirPath, TEXT("\\DOSDEVICES\\"));
   wcscat(pDirPath, lpwsDirPath);

   LocalFree(lpwsDirPath);

	
   RtlInitUnicodeString(&DirectoryName, pDirPath);


   InitializeObjectAttributes(&ObjectAttributes,
				 	 &DirectoryName,
					 OBJ_CASE_INSENSITIVE,
					 NULL,
					 NULL);

   Status = NtOpenFile(&DirHandle,
			   WRITE_DAC | READ_CONTROL | SYNCHRONIZE,
			   &ObjectAttributes,
			   &IoStatusBlock,
			   FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE ,
			   FILE_DIRECTORY_FILE | FILE_SYNCHRONOUS_IO_NONALERT);


   LocalFree(pDirPath);

   if(!NT_SUCCESS(Status)) {

#ifdef DEBUG

	  DbgPrint("UAMSETSECURITY: NtOpen File Failed\n");
#endif
	  return(FALSE);
   }


   do
   {
	  //
	  // Read the security descriptor for this directory
	  //

	  SizeNeeded = 256;
	
	  do
	  {
	      if (pBuffer != NULL)
				LocalFree(pBuffer);
	
			if ((pBuffer = (PBYTE)LocalAlloc(LPTR,SizeNewDacl = SizeNeeded)) == NULL)
			{

				Status = STATUS_NO_MEMORY;
				break;
			}
	
			Status = NtQuerySecurityObject(DirHandle,
										OWNER_SECURITY_INFORMATION |
										GROUP_SECURITY_INFORMATION |
										DACL_SECURITY_INFORMATION,
										(PSECURITY_DESCRIPTOR)pBuffer,
										SizeNeeded, &SizeNeeded);
	
	  } while ((Status != STATUS_SUCCESS) &&
				 ((Status == STATUS_BUFFER_TOO_SMALL)	||
				  (Status == STATUS_BUFFER_OVERFLOW)	||
				  (Status == STATUS_MORE_ENTRIES)));
	
		if (!NT_SUCCESS(Status)) {

			break;
		}
	
		pSecDesc = (PSECURITY_DESCRIPTOR)pBuffer;
	
		// If the security descriptor is in self-relative form, convert to absolute
		if (pSecDesc->Control & SE_SELF_RELATIVE)
		{
			pSecDesc->Control &= ~SE_SELF_RELATIVE;
	
			if (pSecDesc->Owner != NULL)
				pSecDesc->Owner = (PSID)RtlOffsetToPointer(pSecDesc, pSecDesc->Owner);
			if (pSecDesc->Group != NULL)
				pSecDesc->Group = (PSID)RtlOffsetToPointer(pSecDesc, pSecDesc->Group);
			if (pSecDesc->Dacl  != NULL)
				pSecDesc->Dacl  = (PACL)RtlOffsetToPointer(pSecDesc, pSecDesc->Dacl);
		}
	
		// Construct the new Dacl. This consists of Aces for World, Owner and Group
		// followed by Old Aces for everybody else, but with Aces for World, OldOwner
		// and OldGroup stripped out. First determine space for the new Dacl and
		// allocated space for the new Dacl. Lets be exteremely conservative. We
		// have two aces each for owner/group/world.
	
		SizeNewDacl +=
				(RtlLengthSid(pSecDesc->Owner) + sizeof(ACCESS_ALLOWED_ACE) +
				 RtlLengthSid(pSecDesc->Group) + sizeof(ACCESS_ALLOWED_ACE) +
				 RtlLengthSid(&AfpSidSystem) + sizeof(ACCESS_ALLOWED_ACE) +
				 RtlLengthSid(&AfpSidWorld) + sizeof(ACCESS_ALLOWED_ACE)) * 3;
	
		if ((pDaclNew = (PACL)LocalAlloc(LPTR,SizeNewDacl)) == NULL)
		{

			Status = STATUS_NO_MEMORY;
			break;
		}
	
		RtlCreateAcl(pDaclNew, SizeNewDacl, ACL_REVISION);
		pAce = (PACCESS_ALLOWED_ACE)((PBYTE)pDaclNew + sizeof(ACL));
	
		// At this time the Acl list is empty, i.e. no access for anybody
		// Start off by copying the Deny Aces from the original Dacl list
		// weeding out the Aces for World, old and new owner, new and old
		// group, creator owner and creator group
		if (pSecDesc->Dacl != NULL)
		{
			pAce = afpMoveAces(pSecDesc->Dacl, pAce, pSecDesc->Owner,
							pSecDesc->Owner, pSecDesc->Group, pSecDesc->Group,
							TRUE, pDaclNew);

		}

		// Now add Aces for System, World, Group & Owner - in that order
		pAce = afpAddAceToAcl(pDaclNew,
					   pAce,
					   AFP_READ_ACCESS,
					   &AfpSidSystem,
					   &AfpSidSystem);
	
		pAce = afpAddAceToAcl(pDaclNew,
					   pAce,
					   AFP_READ_ACCESS,
					   &AfpSidWorld,
					   NULL);
	
		pAce = afpAddAceToAcl(pDaclNew,
					 pAce,
					 AFP_READ_ACCESS ,
					 pSecDesc->Group,
					 &AfpSidCrtrGroup);

		pAce = afpAddAceToAcl(pDaclNew,
						pAce,
						AFP_READ_ACCESS |  AFP_WRITE_ACCESS,
						pSecDesc->Owner,
						&AfpSidCrtrOwner);


		// Now add in the Grant Aces from the original Dacl list weeding out
		// the Aces for World, old and new owner, new and old group, creator
		// owner and creator group
		if (pSecDesc->Dacl != NULL)
		{
			pAce = afpMoveAces(pSecDesc->Dacl, pAce, pSecDesc->Owner,
							pSecDesc->Owner, pSecDesc->Group, pSecDesc->Group,
							FALSE, pDaclNew);

		}

		// Now set the new security descriptor
		pSecDesc->Dacl = pDaclNew;
	
		Status = NtSetSecurityObject(DirHandle, SecInfo, pSecDesc);


	} while (FALSE);

	// Free the allocated buffers before we return
	if (pBuffer != NULL)
		LocalFree(pBuffer);
	if (pDaclNew != NULL)
		LocalFree(pDaclNew);

   if(NT_SUCCESS(Status)) {

	  lstrcpy(ReturnTextBuffer, TEXT("SUCCESS"));

	  return(TRUE);
   }

   return FALSE;
}