mirror of
https://github.com/reactos/reactos.git
synced 2024-11-18 21:13:52 +00:00
680 lines
21 KiB
C
680 lines
21 KiB
C
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS system libraries
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* PURPOSE: Boot Data implementation
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* FILE: lib/rtl/bootdata.c
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* PROGRAMMERS:
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*/
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/* INCLUDES *****************************************************************/
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#include <rtl.h>
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#define NDEBUG
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#include <debug.h>
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/* FUNCTIONS *****************************************************************/
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static SID_IDENTIFIER_AUTHORITY LocalSystemAuthority = {SECURITY_NT_AUTHORITY};
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static NTSTATUS
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RtlpSysVolCreateSecurityDescriptor(OUT PISECURITY_DESCRIPTOR *SecurityDescriptor,
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OUT PSID *SystemSid)
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{
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PSECURITY_DESCRIPTOR AbsSD = NULL;
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PSID LocalSystemSid = NULL;
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PACL Dacl = NULL;
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ULONG DaclSize;
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NTSTATUS Status;
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/* create the local SYSTEM SID */
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Status = RtlAllocateAndInitializeSid(&LocalSystemAuthority,
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1,
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SECURITY_LOCAL_SYSTEM_RID,
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0,
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0,
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0,
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0,
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0,
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0,
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0,
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&LocalSystemSid);
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if (!NT_SUCCESS(Status))
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{
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return Status;
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}
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/* allocate and initialize the security descriptor */
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AbsSD = RtlpAllocateMemory(sizeof(SECURITY_DESCRIPTOR),
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'dSeS');
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if (AbsSD == NULL)
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{
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Status = STATUS_NO_MEMORY;
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goto Cleanup;
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}
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Status = RtlCreateSecurityDescriptor(AbsSD,
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SECURITY_DESCRIPTOR_REVISION);
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if (!NT_SUCCESS(Status))
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{
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goto Cleanup;
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}
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/* allocate and create the DACL */
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DaclSize = sizeof(ACL) + sizeof(ACE) +
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RtlLengthSid(LocalSystemSid);
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Dacl = RtlpAllocateMemory(DaclSize,
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'cAeS');
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if (Dacl == NULL)
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{
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Status = STATUS_NO_MEMORY;
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goto Cleanup;
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}
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Status = RtlCreateAcl(Dacl,
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DaclSize,
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ACL_REVISION);
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if (!NT_SUCCESS(Status))
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{
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goto Cleanup;
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}
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Status = RtlAddAccessAllowedAceEx(Dacl,
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ACL_REVISION,
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OBJECT_INHERIT_ACE | CONTAINER_INHERIT_ACE,
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STANDARD_RIGHTS_ALL | SPECIFIC_RIGHTS_ALL,
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LocalSystemSid);
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if (!NT_SUCCESS(Status))
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{
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goto Cleanup;
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}
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/* set the DACL in the security descriptor */
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Status = RtlSetDaclSecurityDescriptor(AbsSD,
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TRUE,
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Dacl,
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FALSE);
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/* all done */
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if (NT_SUCCESS(Status))
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{
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*SecurityDescriptor = AbsSD;
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*SystemSid = LocalSystemSid;
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}
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else
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{
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Cleanup:
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if (LocalSystemSid != NULL)
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{
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RtlFreeSid(LocalSystemSid);
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}
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if (Dacl != NULL)
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{
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RtlpFreeMemory(Dacl,
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'cAeS');
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}
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if (AbsSD != NULL)
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{
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RtlpFreeMemory(AbsSD,
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'dSeS');
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}
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}
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return Status;
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}
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static NTSTATUS
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RtlpSysVolCheckOwnerAndSecurity(IN HANDLE DirectoryHandle,
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IN PISECURITY_DESCRIPTOR SecurityDescriptor)
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{
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PSECURITY_DESCRIPTOR RelSD = NULL;
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PSECURITY_DESCRIPTOR NewRelSD = NULL;
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PSECURITY_DESCRIPTOR AbsSD = NULL;
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#ifdef _WIN64
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BOOLEAN AbsSDAllocated = FALSE;
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#endif
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PSID AdminSid = NULL;
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PSID LocalSystemSid = NULL;
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ULONG DescriptorSize;
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ULONG AbsSDSize, RelSDSize = 0;
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PACL Dacl;
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BOOLEAN DaclPresent, DaclDefaulted;
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PSID OwnerSid;
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BOOLEAN OwnerDefaulted;
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ULONG AceIndex;
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PACE Ace = NULL;
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NTSTATUS Status;
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/* find out how much memory we need to allocate for the self-relative
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descriptor we're querying */
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Status = ZwQuerySecurityObject(DirectoryHandle,
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OWNER_SECURITY_INFORMATION | DACL_SECURITY_INFORMATION,
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NULL,
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0,
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&DescriptorSize);
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if (Status != STATUS_BUFFER_TOO_SMALL)
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{
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/* looks like the FS doesn't support security... return success */
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Status = STATUS_SUCCESS;
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goto Cleanup;
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}
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/* allocate enough memory for the security descriptor */
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RelSD = RtlpAllocateMemory(DescriptorSize,
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'dSeS');
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if (RelSD == NULL)
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{
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Status = STATUS_NO_MEMORY;
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goto Cleanup;
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}
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/* query the self-relative security descriptor */
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Status = ZwQuerySecurityObject(DirectoryHandle,
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OWNER_SECURITY_INFORMATION | DACL_SECURITY_INFORMATION,
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RelSD,
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DescriptorSize,
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&DescriptorSize);
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if (!NT_SUCCESS(Status))
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{
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/* FIXME - handle the case where someone else modified the owner and/or
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DACL while we allocated memory. But that should be *very*
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unlikely.... */
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goto Cleanup;
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}
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/* query the owner and DACL from the descriptor */
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Status = RtlGetOwnerSecurityDescriptor(RelSD,
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&OwnerSid,
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&OwnerDefaulted);
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if (!NT_SUCCESS(Status))
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{
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goto Cleanup;
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}
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Status = RtlGetDaclSecurityDescriptor(RelSD,
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&DaclPresent,
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&Dacl,
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&DaclDefaulted);
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if (!NT_SUCCESS(Status))
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{
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goto Cleanup;
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}
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/* create the Administrators SID */
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Status = RtlAllocateAndInitializeSid(&LocalSystemAuthority,
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2,
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SECURITY_BUILTIN_DOMAIN_RID,
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DOMAIN_ALIAS_RID_ADMINS,
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0,
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0,
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0,
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0,
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0,
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0,
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&AdminSid);
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if (!NT_SUCCESS(Status))
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{
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goto Cleanup;
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}
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/* create the local SYSTEM SID */
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Status = RtlAllocateAndInitializeSid(&LocalSystemAuthority,
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1,
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SECURITY_LOCAL_SYSTEM_RID,
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0,
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0,
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0,
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0,
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0,
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0,
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0,
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&LocalSystemSid);
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if (!NT_SUCCESS(Status))
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{
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goto Cleanup;
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}
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/* check if the Administrators are the owner and at least a not-NULL DACL
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is present */
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if (OwnerSid != NULL &&
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RtlEqualSid(OwnerSid,
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AdminSid) &&
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DaclPresent && Dacl != NULL)
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{
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/* check the DACL for an Allowed ACE for the SYSTEM account */
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AceIndex = 0;
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do
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{
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Status = RtlGetAce(Dacl,
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AceIndex++,
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(PVOID*)&Ace);
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if (!NT_SUCCESS(Status))
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{
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Ace = NULL;
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}
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else if (Ace != NULL && Ace->Header.AceType == ACCESS_ALLOWED_ACE_TYPE)
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{
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/* check if the the ACE is a set of allowed permissions for the
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local SYSTEM account */
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if (RtlEqualSid((PSID)(Ace + 1),
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LocalSystemSid))
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{
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/* check if the ACE is inherited by noncontainer and
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container objects, if not attempt to change that */
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if (!(Ace->Header.AceFlags & OBJECT_INHERIT_ACE) ||
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!(Ace->Header.AceFlags & CONTAINER_INHERIT_ACE))
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{
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Ace->Header.AceFlags |= OBJECT_INHERIT_ACE | CONTAINER_INHERIT_ACE;
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Status = ZwSetSecurityObject(DirectoryHandle,
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DACL_SECURITY_INFORMATION,
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RelSD);
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}
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else
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{
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/* all done, we have access */
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Status = STATUS_SUCCESS;
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}
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goto Cleanup;
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}
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}
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} while (Ace != NULL);
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}
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AbsSDSize = DescriptorSize;
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/* because we need to change any existing data we need to convert it to
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an absolute security descriptor first */
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Status = RtlSelfRelativeToAbsoluteSD2(RelSD,
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&AbsSDSize);
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#ifdef _WIN64
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if (Status == STATUS_BUFFER_TOO_SMALL)
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{
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/* this error code can only be returned on 64 bit builds because
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the size of an absolute security descriptor is greater than the
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size of a self-relative security descriptor */
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ASSERT(AbsSDSize > DescriptorSize);
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AbsSD = RtlpAllocateMemory(DescriptorSize,
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'dSeS');
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if (AbsSD == NULL)
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{
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Status = STATUS_NO_MEMORY;
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goto Cleanup;
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}
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AbsSDAllocated = TRUE;
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/* make a raw copy of the self-relative descriptor */
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RtlCopyMemory(AbsSD,
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RelSD,
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DescriptorSize);
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/* finally convert it */
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Status = RtlSelfRelativeToAbsoluteSD2(AbsSD,
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&AbsSDSize);
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}
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else
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#endif
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{
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AbsSD = RelSD;
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}
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if (!NT_SUCCESS(Status))
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{
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goto Cleanup;
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}
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/* set the owner SID */
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Status = RtlSetOwnerSecurityDescriptor(AbsSD,
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AdminSid,
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FALSE);
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if (!NT_SUCCESS(Status))
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{
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goto Cleanup;
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}
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/* set the DACL in the security descriptor */
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Status = RtlSetDaclSecurityDescriptor(AbsSD,
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TRUE,
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SecurityDescriptor->Dacl,
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FALSE);
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if (!NT_SUCCESS(Status))
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{
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goto Cleanup;
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}
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/* convert it back to a self-relative descriptor, find out how much
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memory we need */
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Status = RtlAbsoluteToSelfRelativeSD(AbsSD,
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NULL,
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&RelSDSize);
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if (Status != STATUS_BUFFER_TOO_SMALL)
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{
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goto Cleanup;
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}
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/* allocate enough memory for the new self-relative descriptor */
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NewRelSD = RtlpAllocateMemory(RelSDSize,
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'dSeS');
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if (NewRelSD == NULL)
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{
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Status = STATUS_NO_MEMORY;
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goto Cleanup;
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}
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/* convert the security descriptor to self-relative format */
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Status = RtlAbsoluteToSelfRelativeSD(AbsSD,
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NewRelSD,
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&RelSDSize);
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if (Status == STATUS_BUFFER_TOO_SMALL)
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{
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goto Cleanup;
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}
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/* finally attempt to change the security information */
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Status = ZwSetSecurityObject(DirectoryHandle,
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OWNER_SECURITY_INFORMATION | DACL_SECURITY_INFORMATION,
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NewRelSD);
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Cleanup:
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if (AdminSid != NULL)
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{
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RtlFreeSid(AdminSid);
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}
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if (LocalSystemSid != NULL)
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{
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RtlFreeSid(LocalSystemSid);
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}
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if (RelSD != NULL)
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{
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RtlpFreeMemory(RelSD,
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'dSeS');
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}
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if (NewRelSD != NULL)
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{
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RtlpFreeMemory(NewRelSD,
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'dSeS');
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}
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#ifdef _WIN64
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if (AbsSDAllocated)
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{
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RtlpFreeMemory(AbsSD,
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'dSeS');
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}
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#endif
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return Status;
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}
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_Must_inspect_result_
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static
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NTSTATUS
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RtlpSysVolTakeOwnership(IN PUNICODE_STRING DirectoryPath,
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IN PSECURITY_DESCRIPTOR SecurityDescriptor)
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{
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TOKEN_PRIVILEGES TokenPrivileges;
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OBJECT_ATTRIBUTES ObjectAttributes;
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SECURITY_DESCRIPTOR AbsSD;
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PSID AdminSid = NULL;
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IO_STATUS_BLOCK IoStatusBlock;
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BOOLEAN TokenEnabled = FALSE;
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HANDLE hToken = NULL;
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HANDLE hDirectory = NULL;
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NTSTATUS Status;
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ULONG ReturnLength;
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Status = ZwOpenProcessToken(NtCurrentProcess(),
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TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES,
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&hToken);
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if (!NT_SUCCESS(Status))
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{
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goto Cleanup;
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}
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/* attempt to enable the SE_TAKE_OWNERSHIP_PRIVILEGE privilege */
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TokenPrivileges.PrivilegeCount = 1;
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TokenPrivileges.Privileges[0].Luid.LowPart = SE_TAKE_OWNERSHIP_PRIVILEGE;
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TokenPrivileges.Privileges[0].Luid.HighPart = 0;
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TokenPrivileges.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
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Status = ZwAdjustPrivilegesToken(hToken,
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FALSE,
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&TokenPrivileges,
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sizeof(TokenPrivileges),
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&TokenPrivileges,
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&ReturnLength);
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if (!NT_SUCCESS(Status))
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{
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goto Cleanup;
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}
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TokenEnabled = (TokenPrivileges.PrivilegeCount != 0);
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/* open the directory */
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InitializeObjectAttributes(&ObjectAttributes,
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DirectoryPath,
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0,
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NULL,
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SecurityDescriptor);
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Status = ZwOpenFile(&hDirectory,
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SYNCHRONIZE | WRITE_OWNER,
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&ObjectAttributes,
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&IoStatusBlock,
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FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
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FILE_DIRECTORY_FILE | FILE_SYNCHRONOUS_IO_NONALERT);
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if (!NT_SUCCESS(Status))
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{
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goto Cleanup;
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}
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/* create the Administrators SID */
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Status = RtlAllocateAndInitializeSid(&LocalSystemAuthority,
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2,
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SECURITY_BUILTIN_DOMAIN_RID,
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DOMAIN_ALIAS_RID_ADMINS,
|
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0,
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0,
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0,
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0,
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0,
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0,
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&AdminSid);
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if (!NT_SUCCESS(Status))
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{
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goto Cleanup;
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}
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/* create the security descriptor */
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Status = RtlCreateSecurityDescriptor(&AbsSD,
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SECURITY_DESCRIPTOR_REVISION);
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if (!NT_SUCCESS(Status))
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{
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goto Cleanup;
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}
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Status = RtlSetOwnerSecurityDescriptor(&AbsSD,
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AdminSid,
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FALSE);
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if (!NT_SUCCESS(Status))
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{
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goto Cleanup;
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}
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/* attempt to take ownership */
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Status = ZwSetSecurityObject(hDirectory,
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OWNER_SECURITY_INFORMATION,
|
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&AbsSD);
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Cleanup:
|
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if (TokenEnabled)
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{
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/* Disable privileges that we had to enable, whetever the result was. */
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NTSTATUS Status2 = ZwAdjustPrivilegesToken(hToken,
|
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FALSE,
|
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&TokenPrivileges,
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0,
|
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NULL,
|
|
NULL);
|
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/* This must succeed */
|
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ASSERT(NT_SUCCESS(Status2));
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(void)Status2;
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}
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|
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if (AdminSid != NULL)
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{
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RtlFreeSid(AdminSid);
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}
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|
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if (hDirectory != NULL)
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{
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ZwClose(hDirectory);
|
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}
|
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|
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if (hToken != NULL)
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{
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ZwClose(hToken);
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}
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|
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return Status;
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}
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|
|
/*
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* @implemented
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*/
|
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NTSTATUS
|
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NTAPI
|
|
RtlCreateSystemVolumeInformationFolder(IN PUNICODE_STRING VolumeRootPath)
|
|
{
|
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OBJECT_ATTRIBUTES ObjectAttributes;
|
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IO_STATUS_BLOCK IoStatusBlock;
|
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HANDLE hDirectory;
|
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UNICODE_STRING DirectoryName, NewPath;
|
|
ULONG PathLen;
|
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PISECURITY_DESCRIPTOR SecurityDescriptor = NULL;
|
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PSID SystemSid = NULL;
|
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BOOLEAN AddSep = FALSE;
|
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NTSTATUS Status;
|
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|
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PAGED_CODE_RTL();
|
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|
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RtlInitUnicodeString(&DirectoryName,
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L"System Volume Information");
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PathLen = VolumeRootPath->Length + DirectoryName.Length;
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|
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/* make sure we don't overflow while appending the strings */
|
|
if (PathLen > 0xFFFC)
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{
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return STATUS_INVALID_PARAMETER;
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}
|
|
|
|
if (VolumeRootPath->Buffer[(VolumeRootPath->Length / sizeof(WCHAR)) - 1] != L'\\')
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|
{
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AddSep = TRUE;
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PathLen += sizeof(WCHAR);
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}
|
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|
|
/* allocate the new string */
|
|
NewPath.MaximumLength = (USHORT)PathLen + sizeof(WCHAR);
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|
NewPath.Buffer = RtlpAllocateStringMemory(NewPath.MaximumLength,
|
|
TAG_USTR);
|
|
if (NewPath.Buffer == NULL)
|
|
{
|
|
return STATUS_INSUFFICIENT_RESOURCES;
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|
}
|
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|
|
/* create the new path string */
|
|
NewPath.Length = VolumeRootPath->Length;
|
|
RtlCopyMemory(NewPath.Buffer,
|
|
VolumeRootPath->Buffer,
|
|
NewPath.Length);
|
|
if (AddSep)
|
|
{
|
|
NewPath.Buffer[NewPath.Length / sizeof(WCHAR)] = L'\\';
|
|
NewPath.Length += sizeof(WCHAR);
|
|
}
|
|
RtlCopyMemory(NewPath.Buffer + (NewPath.Length / sizeof(WCHAR)),
|
|
DirectoryName.Buffer,
|
|
DirectoryName.Length);
|
|
NewPath.Length += DirectoryName.Length;
|
|
NewPath.Buffer[NewPath.Length / sizeof(WCHAR)] = L'\0';
|
|
|
|
ASSERT(NewPath.Length == PathLen);
|
|
ASSERT(NewPath.Length == NewPath.MaximumLength - sizeof(WCHAR));
|
|
|
|
/* create the security descriptor for the new directory */
|
|
Status = RtlpSysVolCreateSecurityDescriptor(&SecurityDescriptor,
|
|
&SystemSid);
|
|
if (NT_SUCCESS(Status))
|
|
{
|
|
/* create or open the directory */
|
|
InitializeObjectAttributes(&ObjectAttributes,
|
|
&NewPath,
|
|
0,
|
|
NULL,
|
|
SecurityDescriptor);
|
|
|
|
Status = ZwCreateFile(&hDirectory,
|
|
SYNCHRONIZE | WRITE_OWNER | WRITE_DAC | READ_CONTROL,
|
|
&ObjectAttributes,
|
|
&IoStatusBlock,
|
|
NULL,
|
|
FILE_ATTRIBUTE_SYSTEM | FILE_ATTRIBUTE_HIDDEN,
|
|
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
|
|
FILE_OPEN_IF,
|
|
FILE_DIRECTORY_FILE | FILE_SYNCHRONOUS_IO_NONALERT,
|
|
NULL,
|
|
0);
|
|
if (!NT_SUCCESS(Status))
|
|
{
|
|
Status = RtlpSysVolTakeOwnership(&NewPath,
|
|
SecurityDescriptor);
|
|
|
|
if (NT_SUCCESS(Status))
|
|
{
|
|
/* successfully took ownership, attempt to open it */
|
|
Status = ZwCreateFile(&hDirectory,
|
|
SYNCHRONIZE | WRITE_OWNER | WRITE_DAC | READ_CONTROL,
|
|
&ObjectAttributes,
|
|
&IoStatusBlock,
|
|
NULL,
|
|
FILE_ATTRIBUTE_SYSTEM | FILE_ATTRIBUTE_HIDDEN,
|
|
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
|
|
FILE_OPEN_IF,
|
|
FILE_DIRECTORY_FILE | FILE_SYNCHRONOUS_IO_NONALERT,
|
|
NULL,
|
|
0);
|
|
}
|
|
}
|
|
|
|
if (NT_SUCCESS(Status))
|
|
{
|
|
/* check security now and adjust it if neccessary */
|
|
Status = RtlpSysVolCheckOwnerAndSecurity(hDirectory,
|
|
SecurityDescriptor);
|
|
ZwClose(hDirectory);
|
|
}
|
|
|
|
/* free allocated memory */
|
|
ASSERT(SecurityDescriptor != NULL);
|
|
ASSERT(SecurityDescriptor->Dacl != NULL);
|
|
|
|
RtlpFreeMemory(SecurityDescriptor->Dacl,
|
|
'cAeS');
|
|
RtlpFreeMemory(SecurityDescriptor,
|
|
'dSeS');
|
|
|
|
RtlFreeSid(SystemSid);
|
|
}
|
|
|
|
RtlpFreeStringMemory(NewPath.Buffer,
|
|
TAG_USTR);
|
|
return Status;
|
|
}
|
|
|
|
/* EOF */
|