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SID structure (ntifs.h)

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The security identifier (SID) structure is a variable-length structure used to uniquely identify users or groups.

Drivers must not modify the SID structure directly. To create and manipulate a security identifier, use the support routines listed in the See Also section.

Syntax

typedef struct _SID {
  UCHAR                    Revision;
  UCHAR                    SubAuthorityCount;
  SID_IDENTIFIER_AUTHORITY IdentifierAuthority;
#if ...
  ULONG                    *SubAuthority[];
#else
  ULONG                    SubAuthority[ANYSIZE_ARRAY];
#endif
} SID, *PISID;

Members

Revision

The revision level assigned to the SID.

SubAuthorityCount

Number of subauthorities in the SID.

IdentifierAuthority

A SID_IDENTIFIER_AUTHORITY structure that represents the top-level authority of the SID.

SubAuthority[*]

SubAuthority[ANYSIZE_ARRAY]

Requirements

Requirement Value
Header ntifs.h (include Ntifs.h)

See also

RtlCopySid

RtlEqualPrefixSid

RtlEqualSid

RtlGetOwnerSecurityDescriptor

RtlInitializeSid

RtlLengthSid

RtlSetOwnerSecurityDescriptor

RtlSubAuthoritySid

RtlValidSid

SID_AND_ATTRIBUTES

SID_IDENTIFIER_AUTHORITY