GetKernelObjectSecurity

The GetKernelObjectSecurity function retrieves a copy of the security descriptor protecting a kernel object.

BOOL GetKernelObjectSecurity(
  HANDLE Handle,                             // handle to object
  SECURITY_INFORMATION RequestedInformation, // request
  PSECURITY_DESCRIPTOR pSecurityDescriptor,  // SD
  DWORD nLength,                             // size of SD
  LPDWORD lpnLengthNeeded                    // required size of buffer
);

Parameters

Handle

[in] Handle to a kernel object.

RequestedInformation

[in] Specifies a SECURITY_INFORMATION value that identifies the security information being requested.

pSecurityDescriptor

[out] Pointer to a buffer the function fills with a copy of the security descriptor of the specified object. The calling process must have the right to view the specified aspects of the object's security status. The SECURITY_DESCRIPTOR structure is returned in self-relative format.

nLength

[in] Specifies the size, in bytes, of the buffer pointed to by the pSecurityDescriptor parameter.

lpnLengthNeeded

[out] Pointer to a variable the function sets to zero if the descriptor is copied successfully. If the buffer is too small for the security descriptor, this variable receives the number of bytes required. If this variable's value is greater than the value of the nLength parameter when the function returns, none of the security descriptor is copied to the buffer.

Return Values

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

Remarks

To read the owner, group, or DACL from the kernel object's security descriptor, the calling process must have been granted READ_CONTROL access when the handle was opened. To get READ_CONTROL access, the caller must be the owner of the object or the object's DACL must grant the access.

To read the SACL from the security descriptor, the calling process must have been granted ACCESS_SYSTEM_SECURITY access when the handle was opened. The proper way to get this access is to enable the SE_SECURITY_NAME privilege in the caller's current token, open the handle for ACCESS_SYSTEM_SECURITY access, and then disable the privilege.

Requirements

  Windows NT/2000: Requires Windows NT 3.1 or later.
  Header: Declared in Winbase.h; include Windows.h.
  Library: Use Advapi32.lib.

See Also

Low-Level Access-Control Overview, Low-Level Access Control Functions, GetFileSecurity, GetPrivateObjectSecurity, GetUserObjectSecurity, SECURITY_DESCRIPTOR, SECURITY_INFORMATION, SetKernelObjectSecurity